NGEN's a good candidate but I was long that stock for a long time and I was holding it when it went over 100. I probably should stay away from it now. lol
Yes, I can imagine being short and seeing the stock go up 50%. It could happen to me! I've just been day trading RIMM on the short side, hoping that will minimize my risk. It looks like I might not be able to get another short position before I have to leave for an appointment. :(