Probably some shithead hipster, who doesn't even own a bike or if he/she does, doesn't usually wear a helmet. You can't leave anything down for more than one minute. Some thieving piece-o-shit stole a hoodie from me at a show just this year.

Most reasonable I, Anon ever. Suerte on getting back your helm, and who knows? Maybe there was a really big tandem fest in town and he needed it to impress a girl. And he was on acid, and needed to contain his brain!

Reasonable. But the thief was probably just some drunk. I wouldn't bother trying to work out the logic of the crime.