I don't know if anyone mentioned this, but at one place where I worked we had a party at a restuarant and we would rent out the back room. We had to buy a gift under a certain amount and wrap it. Everyone had to pick a number and went in order to pick out one of the gifts. If you didn't like what you got you could take someone elses (which is why it was always best to be last) You could only trade once and then of course there was always the possibility someone else could always take that away from you.....