The Rubber Band Bass.

You might call it a hunk of crap, yet some might call it a revolutionary invention, or even a hunk or revolutionary crap, but whatever you call it, it's still awesome. It sounds like a real bass, it has an electric version, can be tuned, and can all be made at home. Follow these directions: (copy and paste)
http://www.wikihow.com/Make-a-Rubber-Band-Bass
and here's the video of the electric one: (skip to 1:56 for the playing of it)

Remember, that's the electric one, and on bamboo. The guide explains how to make an acoustic one. Here's an acoustic one (It was my first one, its the "Stinger B.C" model, with a giant soundboard, four strings and an oversized bridge.:

Bye, Next post is on, uhhhhh, I'll think of something.