well i've seen a double bowled pipe that kind of looked like a T....in order to hit it you either had to cover one bowl with your thumb or something (to use as a carp, choke, shotgun whatever you wanna call it) or do both at once...meaning it takes two people or have to hold the pipe with your mouth while you hit it...unless you made a lighter stand of some kind with a close hanger...that gives me an idea....now i can make it easier for knife hits....lol