Riding home from work last Tuesday on my new bike, I'd forgotten to adjust the tension on the Look pedals so they were harder to unclip from. Had a driver intentionally or unintentionally try to squeeze me into a curb while going under a railroad bridge. I stopped in time to avoid that, but couldn't make a strong enough effort to unclip and though stopped, went down hard (at my weight, any fall is a hard one). Smacked my head hard against the concrete bridge abutment, but didn't really feel it thanks to my helmet. Landed on my right arm/shoulder, and yes, I felt that. Still feel it. But two upsides: 1)the bike was OK!, and 2)there's video of it:
Went back to riding the TriCross with its SPD pedals that are easier to clip out of. Have also adjusted the Looks on the Aethos to keep that bike (and me) out of trouble.