Me and my friend spent like 3 days building a bong out of a bicycle pump, that shit stood like 4 feet tall, we had a tube running from the bottom of it into another bottle filled with water, that led into another bottle, and into another, and on the top of that was a large metal cup like thingy that we placed some wire mesh in to filter it. God that thing was beastly, like first hit would send you flying to Africa. Haha. :rastasmoke: