Several years ago, on the Boardwalk in Atlantic City, there was a person (I think female, but it's been awhile, and I don't exactly remember), who played a keyboard and set out her hat for people to drop money in. She not only was legless, she was also armless. How did she play? She played with her tongue! Of course, she couldn't play chords, but she was pretty good at playing a single note at a time.
Saw her in AC back in the mid-80s.