OK, some aren't one-liners... and it's a LONG list, btw! WOAH!

Didn't realize it was THAT long!
Blackarachnia: "He's wacko."
Waspinator: "Wacko? No! Wonko! Wonko the Sane!"
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Ravage: "Decepticons... FOREVER!"
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Rattrap: "Think I touched a noive!"
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Rattrap: "What, is my gearbox hangin' out or somethin'?"
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Optimus: "Looks like Waspinator's on a sugar binge. How long's he been doing that?"
Tigatron: "Long enough to make my head spin."
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Tigerhawk: "You're insane."
Tarantulas: "So they say!" (I can say that line exactly the same way when my voice goes hoarse during hayfever!)
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Tigerhawk: "Perhaps... but it is my destiny to try. I will hold the line here. Go!" (...I loved the delivery of the line the most...)
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Tarantulas: "Heh heh heh heh... heeyah ha ha hah... HeeYAHHAHAHAHA!!"
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Rattrap: "Man, and I thought Optimus's speeches were bad."
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Optimus: "But if your caution circuits are overriding your courage, then SMELT YOU ALL!!"
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Optimus: "That's right, says me. You wanna question my orders ONE MORE TIME?"
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Optimus: "There's just no pleasing some people." (His sense of humor reminds me of G1 Prime! ^___^)
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Optimus: "You can learn a lot from Rattrap. If you can stand him."
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Megatron: "Attention all Predacons -- pull yourselves together." (and the Preds proceed to do exactly that)
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Rattrap: "Oh man, I'm starting to sound like Optimus Pinhead..."
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Optimus: "I think Megatron's bitten off a little more than he can handle. Yeeeess." (I just can't help liking the way how he imitated Megs...)
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Rattrap: "I know, I know. 'Shut up, Rattrap.'"
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Tarantulas: "Well then, partner, let's head 'em up an' move 'em out!" (...I think he's not really cut for a cowboy part... xD)
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Rattrap: "No can do, Captain Minnow. I'm on a mission!" (It's the nicknames he keeps giving everyone... That phrase is "Kapteeni Muikku" in Finnish. xD)
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Cheetor: "Cheetor! Maximi-- did that already."
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Cheetor: "Hey, take it easy with the power pizzas!" xD
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Tigatron: "Good-bye, Snowstalker. May your hunting grounds shelter you now." T_T (Tigatron seems to be pretty melancholic...)
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Tigatron: "Let the paths lead where they may. I will follow." (a philosopher, this one...)
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Rhinox: "Yep. The very thing that makes us what we are. Every Cybertron, Maximal, or Predacon has one, and each is different. When a Spark goes on-line, there's great joy. When one's extinguished, the Universe weeps." (I didn't know Rhinox could be so eloquent...)
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Rhinox: "For everything that ever was..."
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Rattrap: "Oh boo! Boo hoo! Oh!... don't stop now... you motorheads're killin' me."
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Optimus: "They'll either learn to work together or they'll destroy each other. Right now, I don't really care which."
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Rattrap: "Maximal base, this is Rattrap... HelLO, you READIN' me, Chopperface?"
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Cheetor: "Sheesh! They call me the immature one."
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Rattrap: "Heh heh, ehhhh get over yourself... it's just some kinda nutty snake thing, no need to panic..." (Um, call me weird, but I'm getting a weird image of him talking about a Ronin Warriors character called Sekhmet... o.0)
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Tarantulas: "Heh hee hee... I'm here! Inside your pretty little head, controlling your pretty little thoughts!" (Now
that was a creepy scene...)
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Waspinator: "The idiot does not respond. The idiot is comatose!"
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Tigatron: "In that case... the lady shall ride a tiger." (And now I'm thinking about Whiteblaze and Blackblaze from Ronin Warriors...)
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Blackarachnia: "Oh. Great. I get stuck with the one cat in the world who lands on his head."
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Blackarachnia: "Never mind...What *is* it with guys and high explosives?"
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Silverbolt: "You... SHOT me!"
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Rattrap: "This is your rovin' robot reporter. You want the bad news or the worse news?" (My NTFA friends are dubbing this episode in Swedish!)
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Rattrap: "We get beverage cart service on this flight?"
Optimus: "Just make sure your seats are in the fully upright position."
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Rattrap: "Yo, everybody! Out of the pool!"
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Rattrap: "This hard headed hound just went postal on me!"
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Rattrap: "This mouse is goin' cat hunting. Knievel mode!"
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Rhinox: "Remember that transwarp cell explosion? [Primal just gives him a LOOK] Okay, stupid question." (I LOVED that! xD)
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Optimus: "You... both look like scrap."
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Rattrap: "Yee-ah-ha! Ain't I always said that tin minnow is one of my favorite people?" (TINAMUIKKU! xD)
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Silverbolt: "Do not worry! He has been... disarmed."
Blackarachnia: "To say the least."
(I really liked this one. It at least showed they both have a sense of humor)
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Optimus: "You and Rhinox are our last hope. Defend the -- [ZZZT!!] -- there he is, my little guuuuuy... there he is, my little guy. Isn't he cute."
Rattrap: "That's NOT what I wanted to hear."
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Teletran One: "Core implosion aborted. All systems normal. Have a nice day." (A polite computer... sheesh...)
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Rattrap: "Huh. No power... no weapons...We're all gonna die."
Rhinox: "Yup." (First time someone agreed with Ratty)
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Waspinator: "Not fair! Waspinator minding owwwwwn business, when, bang! Gets whole stasis pod right up the kazootie..."
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Depth Charge: "I've gotta hand it to you, Primal. When you screw up you do it big-time. But thanks for the tip."
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Depth Charge: "Big Preds are my specialty."
Rhinox: "Not too shabby."
Rattrap: "Mm. Still smells like fish."
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Cheetor: "So, give us the scoop! What's it actually feel like, bein' a Pred?"
Rhinox: "Like you're three gigabytes of attitude on a two-gig hard drive. No wonder they got personality problems!"
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Tarantulas: "Tin tyrant."
Megatron: "Treacherous arachnid."
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Blackarachnia: "Lunatic."
Tarantulas: "Witch."
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Depth Charge: "What're you lookin' at?"
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Rhinox: "I'm in a bad mood. Understand?" (Yeah, at least I do)
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Rampage: "Have I told you how much I like ants, huh? Especially fried in a subtle blend of mech fluid and grated gears?"
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Rattrap: "Let him go! The Preds'll change his mind. Or make him into fish sticks."
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Silverbolt: "Why did you save me?"
Blackarachnia: "There... might be other... creatures."
Megatron: "Eww, yuck."
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Megatron: "Whatever." *CLUNK*
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Optimus: "A bot can't even be dead for a decacycle without the whole neighborhood going straight to the smelter."
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Rattrap: "Here, tankie, tankie, tankie..."
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Rattrap: "[*sigh*] My hero! [smooch!]"
Rhinox: "Oh, get down."
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Cheetor: "Those sinus torpedoes of Rhinox's are draining us dry!"
Optimus: "They're not doing much for the decor, either."
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Rattrap: "We're dead, right?"
Optimus: "Not this time... but my arms feel like refried rubber bands."
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Tarantulas: "...We should debate this in private -- not in front of the Maximal!"
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Rattrap: "Ah, don't take this the wrong way, kittycat, but under the circumstances -- go tell someone who cares!"
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Megatron: "This is certainly the most humiliating defeat of my entire career! Ye-e-e-esss..."
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Quickstrike: "HAPPY TRAILS!!"
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Rattrap: "You know what the best thing is? We don't have to see Megatron's ugly mug again till we get back to Cybertron!"
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