I 've never done it and probably won't do it, I really can't afford to lose a few K's on one position, but I think it is sometimes not unreasonable to risk 100-200 shares if you can afford to do it. There is a pattern, if the stock sold off steadily going into the conference call that day and the daily chart doesn't indicate that it might fall off a cliff the next day i.e there is some kind of support AND the overall market has sold so hard that it can't go much lower I would say it's playable if you are bit crazy. You can wait to buy in AH but it moves in a flash. Anyway it 's a bit of a gamble, but no crazier than holding overnight on GNP's in my opinion.