Jon and I have recently been discussing a random superpower that may be beneficial. The idea is that you essentially play the air-guitar, the power being that whatever guitar sound that is occuring in your head is the sound played outloud for all to hear.

The catch? You have to sacrifice a left-testicle to achieve this power. I think I would do it without much thought. You only need one nut to procreate so you can afford to cut one loose. I would just be worried that I might lose the other one to something like cancer or a bad blow.