While it's not exactly a trend, there is a mental illness which causes some people to feel incomplete unless they have a limb amputated. I forget what the illness is called, however. The most recent case I have heard of was some guy freezing his leg beyond repair so that medical staff had no way of saving it. Once the leg was amputated the man said how he finally felt complete and ever since childhood he felt like an amputee trapped in a non-amputee body.