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1. Chemist bots can "taste" with their hands. Kind of like medic hands, except sensitive to chemical composition instead of pressure.
2. G1 (preferably). The Autobots take what they call "love baths"; they lay down on their backs and let swarms of humans climb on top of them, rub their faces, hug their fingers... only the most surly of Autobots don't take them at least 3 times a week. For Decepticons, this is a form of torture.
3. A TFA thought. A lot of TFA bots don't have humanoid mouths (Lugnut and Strika) or have something placed in the way of their mouths (Wasp and Longarm). One of the popular fanon methods of Transformer intercourse is the touching of sparks. So, would bumping chests be their version of kissing?
4. Movie. Optimus doesn't understand why the humans are asking him to say weird stuff, but he's making them laugh, so he's happy. (Inspired by the David Letterman Top Ten list.)
5. G1. Grapple: Please, Bumblebee! "As the Kitchen Sinks" is on!
Bumblebee: No way! I've waited all month to see "Cartoon All Stars to the Rescue"!
6. G1. The song "We Care a Lot" by the band Faith No More originally had lyrics about Madonna and Mr. T. These were changed to instead include the Garbage Pail Kids and, of course, the Transformers. Why? Because when they heard it was the Autobot's (un?)official anthem, they HAD to put them in the song.
7. G1 again. Know why the Minibots are dangerous? They're at CROTCH LEVEL.
a. Sunstreaker: Bumblebee, you little runt, I'm gonn- (PUNCH) GYA!
8. TFA. Optimus, on a very stressful day as Magnus, starts to revert into Bumblebee-ish behavior. He's making faces behind Sentinel's back (and into the camera), hiding organic things (weasels? Cats? ... giant Asian salamanders?) in Perceptor's desk, and ending many an arguement by grabbing the other mech's head and yellng "Got your FACE!"
a. He DOESN'T get booted out of the government, or reprimanded in any way, because Ultra Magnus and Alpha Trion think it's frikkin' FUN.
9. G1, yet another bunny that involves giant Asian salamanders. Autobots not only had the instinct to protect, but also to compulsively teach. Not only does that make their PSAs canon, but it also makes for some weird little moments with the 'bots and their human friends...
a. Hound: Hey, Chip, look what I brought you! (plops down a giant Asian salamander)
10. Any femme bot: A whole team of nothing but mechs? PLEASE, they'll be too busy gossiping with each other to get anything done. Everyone knows mechs need at least one femme around to tell them what to do.
a. And thus, with the winning of the Autobot/Decepticon War, came the Mech's Rights Movement. (What's the opposite of misogyny?)
11. Tracks: Mirage, Mirage! Look at this beautiful human I just found! (holds up Raoul)
Mirage: That thing? But it's hideous! Look at that dark, angular face, those gaudy colors, and the boorish way he holds himself, he-
Tracks: (glare of death)
Mirage: Oh...
(End friendship.)
12. Any Wheeljack, as they all seem to be inventors, HATES when people ask him to simply make something the humans already have Transformer-sized. He's an inventor, frag it, not a replicator! He can make it bigger and better and more efficient!
13. A Combiner teams decides to merge whilst NOT in the midst of battle, just to see what their collective mind makes them do. Oddly enough...
a. Menasor likes to garden.
b. Devastator immediately curls into a ball and naps.
c. Superion, running off Silverbolt's suppressed rage, destroys everything in sight.
14. TFA. Bumblebee: Hi, Boss Bot! Check out th-
Optimus: (doesn't look up) Put the hippopotamus back.
BBB: ... but-
Optimus: Put it back.
BBB: But it's so cute!
Optimus: Put it back.
BBB: But it's got a giant-
Optimus: Put it back.
(Repeat ad naseum.)
15. G1. Optimus Prime realizes his trump card against Combiner bots; he's at CROTCH LEVEL.
a. Menasor: I will DESTROY AUTO- (punch) GYA!
16. G1. Scene: Rec room. Footsteps are heard approaching, quickly and heavily.
Sunstreaker: (rips the door open. He is wet, bubbly, and slimy.) Why was there BACON IN THE SOAP?
Bluestreak: (giggles)
Sunstreaker: (pummels Bluestreak)
Ironhide: (to Optimus) I made it myself.
Optimus: (lost)