Zannes has a few fics u might like - especially this one is friggin hilarious:

You’re Not Just Whistlin’ Pixie
http://zannes.livejournal.com/24205.html

also the author kroki-refur has a lot of funny ones - I like this one myself:

Everything I Know About Marine Biology I Learned from My Brother.
http://kroki-refur.livejournal.com/221446.html

Most of these r transformation!fics. I always seem to find them ridiculously funny - don't know why:D.
Hope that's okay. (sorry don't know how to make the fancy links:S)