A shorter list would've been things that went right...I'm firmly a believer in the saying it's not a true masquerade costume unless it's drawn blood. Saying that, I've actually come away mostly unscathed which is a miracle for me, but certainly most of my costumes tend to break just before going on stage...one nearly sliced into my ear as the string was too thin (Jango - One Piece), one pair of glasses managed to spontaneously break *both* arms as I was next in line to go on (Bernard - Day of the Tentacle) - handy emergency electrical tape to the rescue there. A group of rabid fangirls declared Purple Tentacle to be some sort of hentai tentacle and gave it a good kicking - with my friend still in it..
The variety, mostly. On the
surface it's a pretty daft hobby but the creativity
and the sheer number of different talents or
disciplines it can take from is insane. Thanks
to cosplay I can repair clothing, know what kind of
glue, tape or resin to use for all kinds of repairs,
I've learnt about sewing and patterns, I can now use
a sewing machine, I've learnt about photography and
I have an excuse to have a variety of craft scalpels
just lying around...