i've heard of and seen many home made smoking devices but never this one. my friend just made it the other day. all it is is a pop bottle with a pen in the side. then you just stick your bowl in the part where you'd drink out of, seal it really good with your hand, and suck on the pen. if you do it right (suck slow and make a good seal) it's awesome. the whole bottle fills with smoke and it's kinda like a gravity bong. you could also add another pen for a second person if it's a big bottle. try it out if you please.