I found this...thing, don't know what to call it. But it came off my old paintball gun (which I don't have no more, but it was a rat jr. impy incase anyones curious) and it was a metal piece that connected the bottom line (thing that gets air from the tank to gun) and it happened to fit perfectly into the end of a hollow high-lighter, so I made a bong with it.

The hardest thing about making a home-made anythign is finding a bowl. A bowl is almost always some random object you have to hope you have lying around, like in my case.