Awesome Transformers amigurumi by awesome crocheter voxmortuum. It's probably the best one I've seen, but then again I haven't seen a lot of them :p Check out his/her(?) other works, Pennywise is a creeptastic favorite of mine.
It always amazes me how creative people get with their crochet :3 and people still think its a grandma craft. Aside from the indirect homage to geekery this one takes me straight to my childhood :D