When I was in college we built a two story bong out of pabst cans. Someone on the first floor would have to light it and you'd inhale from the second floor. It took a couple lungfulls to get the smoke all the way up, so it wasnt all that functional, but we thought we were the coolest kids in the world for doing that. When I got kicked out, the campus security guy that was sent to escort me off campus couldnt figure out what the fuck it was.