Is a gravity bong, what we call a "bucket" over here... basicaly a pipe (whe use a glass bottle's neck) taped to a large cooldrink bottle, bottom cut off, then submerged in a bucket of water with the whole mcgafter being picked up out of the water, pipe removed. Then push the bottle back into the water with your mouth covering the place the pipe was before....ending up with 2 litres of smoke in your lungs in one time?
Heheh, I did that once with a guy visiting from germany... coughed my lungs out, and then we just laid on our backs in the bathroom for an hour laughing our arses off....
Pleasant memory