I remember back in college — when fixed gears were at its peak popularity — there was a huge rash of bike thefts. In particular, bike strippings (snagging posts, wheels, even cranksets!). The campus police weren't bothered to do anything, so the local cycling group set up a sting. They left a bait bike (bianchi with aerospoke and sugino messenger cranks) locked to a rack. Low and behold, near dusk, the thief came in, pulled out tools and began trying to dismantle what they could. Quietly, a few people snuck in on the thief and clubbed them with a U-Lock (the long one) before locking him (via around their neck) to the bike rack.