i haven't been hurt in quite a while, and i'm just vain enough to think it's because i learned something from many of my mishaps...

always wear shoes
don't carry a garden rake
rim cement is worth the hassle
lsd only after dark

5 or 6 years ago i was pulling my younger son on one of those half-bikes that attaches to the seat post, and i had just about come to a stop when the steerer of my fork broke. he was fine, although he didn't like the sight of my bloody knees.