I'm thinking of throwing a party in three months or so. A fad that has been getting more popular lately is a foam party. To do this you need a foam machine. Rental for one of these units is well above $100, and sometimes around $400. That's a little pricy for my budget, but I figure that with a bit of makesuft stuff, I could make one that's not only out of household stuff, but I could probably do it better. The boys at MIT have a how-to on making foam, but it seems to me that their machine is very work-laden and wasteful with all the water they spill. Problem: I have no idea how a real foam machine works. So, the idea I came up with today at work (I'm going to go home and try it soon), was to take an air compressor I have with a trigger nozzle and then with a tube underneath the end of the nozzle going to my source of soap-water. But as I think about, I'm guessing that if I do manage to make it rise up the tube and spray out, that I'll end up just spraying soapy water all over my foam-pit. Any ideas on how to effectively make large ammounts of foam with the use of a compressor or wet-dry shop vac?