If you like making percussion-like sounds using your mouth, or you want to learn how to, check out these guys. It sounds like the real thing. I thought I was good until I saw them. There are tutorials and stuff you can view if you want to become a beatbox person. You can listen on any computer but you have to have something relatively powerful for the video and audio to sync up correctly. On my computer, the video is kind of fragmented. Anyway, here's the site.
http://www.beatbox.tv/enter.html
Beatbox
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