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!"