Here's a video that's been going around the interwebs for quite a while now. It's a New Orleans street busker that made a "Fotdella" foot bass piano out of a junked upright bass.
This isn't the first one man band that has used a foot piano. The great blues legend, Jesse Fuller was the original inventor. He called his the Fotdella. Here's a great video of him playing his biggest hit, San Francisco Bay Blues
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Now that's some cool stuff! Excellent footage.