Flickr has an entire pool devoted to them. Some of my faves:
If you happen to be on the set of a Warner Brothers cartoon…
And please, don’t slap the penguins. It upsets them greatly, and when you think about it, there’s really no call for it…
Jazz hands, people!
The approach of large waves will cause Charlie Brown’s limbs to separate from his body….
Sex with dumpsters? That’s a no-no…
If you are Spiderman, avoid casting your web onto, uh, these things…
Modern ballet with industrial machinary? Only on level surfaces. Here’s why….
And finally….
Absolutely NO Savian Glovers!!!