There are certain bits of information you are happier, and perhaps better off, not knowing. A couple examples from the Basic Instructions webcomic I read (link in my blog list to the right): bugs bunny looked better in drag than any of the female looney toons, or that Beaker from the Muppets spoke perfect English but every word needed to be censored. This another case where ignorance is bliss.
Next time you find yourself in bear form (and play a night elf) take a look at your butt, from the side. Pay close attention to what your cute little tail does during the idle animation. How this even got out to the public amazed me. So far as I know this only affects the night elf bear form, but I've not looked at others.
For those of you without easy access to night elf bear form I'll sum up. Like a finger the tail strokes up the backside bottom to top in a most unseemly manner. I'm no expert in bear anatomy, but so far as I know tails don't do that. They do in Warcraft obviously, but probably shouldn't.
So now having noticed this I can either never let my bear idle, or be sure to sit down or change forms. It's like a train wreck; it's terrible; you feel bad about it, but you just can't look away. Oh my.