Takes quite a bit to disturb me, actually. I'm pretty much unphased by violent imagery. Family Guy can have some pretty graphic comedy violence, but I'd say the animators managed to find a way to distort features so they're still pretty funny. Like when Peter's head got smashed between two logs to get a hat. That was a good one. I was only kinda disturbed with that episode of American Dad that ends with Roger ripping Jeff's skin off and wearing it. I find Happy Tree Friends more monotonous than truly disturbing. I mean, the thing's made out of disturbing, but after a while it gets kinda repetitive. I'd also like to say I'm happy that the new TMNT series doesn't sugar coat mutations, and Rahzar, Mutagen Man, and Baxter Stockman had some delightfully horrific results. More disturbing than a kid's show, especially a popular one. But I'm glad not all the Mutants were designed with wacky action figures in mind. And I'd be at a miss to not mention one of my favorite animes, Fist of the North Star where violently exploding heads are the series trademark.
Not to say there aren't things I actually found disturbing.
Gotta admit, first time I saw the teddy bear hallucination sequence in Akira I had trouble sleeping for a few nights. Yeah, you wouldn't want the image of a cute cartoon car getting all veiny and throwing up. oops... probably put that one in your head right now.
Then there was that episode of Stone Quackers I saw. The show's disturbing, but in such a poorly done, awfully written way. The subject matter was disturbing (laboriously so), but the ugly character designs and the feeble attempts at humor by being disturbing just came off far more off putting than funny. Probably the worst cartoon in existence. And the fact that it's just unspeakably bad on every level makes it all the worse.
And of course, the most disturbing of all, Ren and Stimpy Adult Cartoon Party. Didn't see, but heard all about Ren Needs Help (or is it Ren Seeks Help, one was an episode of the kid's show that was disturbing in its own right). But I'm referring to Stimpy's Pregnant. Now, I loved how in the old series Ren would always give Stimpy the business and all... but in this series, they pretty much make them both an official couple. As such, Stimpy somehow becomes the woman because he's pregnant ('cept he really gives birth to a turd) and Ren's wacky, fun abuse of Stimpy who usually LOVES it turns into actual domestic abuse that's played for laughs. Very, very disturbing domestic abuse. Then there's the unproduced cartoon about the Child's Crusade that is the most cynical, depressing, horrifyingly negative thing I've ever seen. And I'm a pretty depressed cynic person! WOW!
Not to say that some of the Games Ren and Stimpy cartoons weren't also disturbing to some extent, but wow... just wow!