I bought a pineapple once, hollowed it out, and made a bong from it. Plus I got to munch on some wicked fruit after.

I also made one from a lightbulb before. I just hollowed out the bulb, found a 2L pepsi bottle lid, screwed 2 holes in it, one for the bowl, one for the hose to inhale from, a viola! I sealed it up using this silicone stuff. Worked great until I broke it Oh well!