My old lemon (not Lemond, lemon in terms of POS) threw the rd into the spokes at the mid point of the commute. No transit, no walking. Called a cab to work and the wife for the way home.

Broke a chain once. Walked towards home until my wife got me, took he a long time though. But the bus was worse, only one passed me in the time it took her to get me. I would have been better off breaking the chain and riding SS.

None others I can think of. I managed to boot the tires and limp to work and home once.