haha I remember when a friend told me that he had put a stop-loss on some high-volume NYSE stock -- I think maybe it was GE -- 5 points below where it was trading, and the market makers took the price down for a few milliseconds so they could buy his stock, and then it went right back up and closed higher that day. Silly me, I thought he must be mistaken. Well, I for one have certainly learned: don't put in hard stops anywhere near market price, and it's better to use trailing stops that the market makers can't see.