Maybe I'm a wimp and didn't crank down on the little lever enough, or my rattle can paint job on the frame made a good lubricant. When my QR slipped, I scraped my ankle pretty good on the crank arm and landed on the top tube going up a short little steep hill. I got rid of the QR pretty soon after that. Besides I was always paranoid about sticky fingered people.

If this posts twice with a somewhat similar text, it wasn't me, sort of.