Owie. I learned that one when my mom dropped a crochet hook and caught it between her calves. It stabbed a good two inches in, and the hook tore the muscle when she pulled it out...
Also, I'm a lab tech...you *never* want to try to catch a dirty, falling needle. It's my instinct, as a result, to do a spread eagle when I drop sharp things - knives, pins, scissors, needles, etc., hands go up, legs spread, and if I'm standing, I jump back.