Don't feel so bad. That's nothing compared to my mysterious click story. A few weeks back my bike suddenly developed a very annoying click every pedal revolution. I checked everything I could: pedals, cranks, bb, front derailleur adjustment. Nothing. Works perfect on the stand, but once I start riding it, the click reappears. Wanna guess what it was? Well, the weather warmed up a few weeks back, so I switched from boots (no laces) to sneakers (laces), and it was the ends of the laces on the left shoe hitting the bike as I was riding. ARGH!