once me and my buddies made something kind of like this:
http://shop.grasscity.com/images/ite.../kb016_400.jpg
with one of those huge water jugs that we took from school. the bowl was some weird metal thing from home depot and we had 4 holes for tubes in the jug so four people could hit it at once. that thing went through weed FAST

we called it bagsworth because it would use a bag's worth every time you smoked with it :rasta: