Bluffing with a Short Stack

If somebody is playing from a position of strength whenever they sit down to play poker you can bet your extra kidney as well 401K that they have extra cards stuffed up their sleeve, under their shirt, and possibly in places that one would need rubber gloves and forceps to get at. In other words, we all find ourselves playing from a weak position and trying to bluff our way back into contention. So when your stack is not so potent, and you want to run a bluff, what should you do?