Art, I do have some brain abnormalities (and the rest of you can just shuddup right now! :-) that make my fingers a little clumsy at times. I don't think people notice that, because I don't play that well anyway. But there's a big difference because the other mistakes are in some way intentional - my fingers are doing exactly what my brain is telling them to (or not to) do.

I lopped off the end of my left index finger when I was 3. I had a cyst removed from it in 1998, and they took off another 1/4". This made playing feel really weird, and I doubt I'll get over that. For one thing, the finger is shorter, but that's not too much of a problem. The thing that drives me nuts is, they pulled up the skin of what was the front of the finger so it's now on the top. When I put the finger down on a string, it feels like I'm using the pad of it, not the end.

This finger makes it difficult for me to properly fret a guitar or any instrument with higher string tension, because the end is not as protected as my other fingers. I'm think about trying left-handed...