What is it about a bicycle that often makes its theft seem so much worse or more personal than the theft of something of similar or greater value? I've had a bike stolen and a bike vandalized into the next century on separate occasions and those two acts made me angrier than almost anything else that's ever happened to me.
I had a beater, junk pile bike. Seat downtube was oddly bent. It had been a 10 speed. I stripped it, made a freewheel fixie. Painted it the ugliest flat yellow I could find. No brakes for the first few months, finally added a front grabber. Drop bars inverted. I rode that thing 10 miles a day for 9 months. I never locked it, ever. I left it leaning one day on the street-side mailbox at my Dad's house, I was in love with my new 900F SS Honda. 20 minutes later it was gone. I stood in the middle of the street shrieking, "FUCKING THIEVES!!111!1!"
The last time a bike of ours was stolen, I had left the garage door open while going to the gas station to get fuel for our lawn mower. Came back and it was gone. The worst part is that you question everyone. Every neighbor immediately seems suspect.
I had a fairly expensive mountain bike stolen from my apartment storage unit, which was locked, and the part of the basement where the units were was had a key coded door also. That pissed me off a lot more than if it would've gotten stolen off the street.
The first thing I had stolen of value was a bike I had borrowed. I had no lock for it. Kept it inside. Stopped for a drink at a pub. Parked it where I could see it. Had a couple, bike was there, paid my tab. GONE. In 60 seconds, like I was being watched. Schwinn Collegiate 3 -speed, helluva bike.