Body-modification-induced body horror, such as people getting eyeball tattoos/implants, tooth filing/implants, and, oddly enough, just thinking about uvula splitting/removal/etc. gets me REALLY freaked out (argh why did I have to think about it)
Strangely enough it's only things like eyes, fingernails, and uvulas (uvulae?) that bug me to that extent. People doing limb amputation, implants, tattoos, and so on don't bother me at all. But even THINK about pulling off a toenail, and I'm having a bad time (argh why did I have to think about it)