made by poking a hole in the cap of a bottle and the bottom of it. u then put a bowl in the hole in the cap and fill the bottle up with water (and put weed in the bowl). lite the weed and unplug the hole at teh bottle. at the water drains out the smoke should be pulled into the chamber. when all teh water has been drained out, take off the cap and suck in teh compressed smoke. if u wanna try sumthing cool, squeeze teh bottle as u inhale so it makes it into a gravity bong =)
man i hit that waterfall bong soooo hard.