Craziest?
Snakes (One of my own friends was a rattlesnake, it was fun watching them crawl after my lil' pup character)
Colors...without Nyan Cat.
Pies
Seacats (I am one, and I think I may have started the craze in Ficho xD)
Anime characters (Sasuke, Naruto, Itachi (another one of my friends), etc.)
Pokemon (This one Pichu I met liked raping things...even rocks, but otherwise this is normal in my FH life)
I bet I've seen crazier, but I forget.