A friend of mine scalloped the frets on his guitar. It looks a nightmare but it would be easy to play if it wasn't for a missing part of the bridge on the high E. He partially killed it with some daft attempt to add a 7th string. I'm so glad he's not a surgeon, he'd practically be an advertisment for pre-clinical death!
If I couldn't laugh at myself how could I laugh at someone less ridiculous?