Whole (2003) is another great documentary on the subject. It feature an elderly gentleman that blew his leg off with a shotgun on purpose because he felt it was not a natural part of his body, and a guy who married a lady who loved hiking and eventually separated because he spent a lot of time artificially strapping up his leg and using crutches to feel normal. I periodically check to see if it has been uploaded to share with poeTV, but no luck as of yet.
I remember an episode of Jerry Springer years ago where they had a cross dressing guy in a wheelchair with no legs because he cut them off himself, because, according to him, from a young age he didn't want them and hated that he had them.
I can't decide which is weirder; this, or bug chasing.