Something that I've come across recently is guys mousetrapping their nuts. It is fun to watch.

Guy flops his balls into a set mousetrap while his friends laugh:
http://www.break.com/usercontent/200...ap-637226.html

Girl mousetraps her tits, then a guy snaps his nuts:
http://www.stileproject.com/videos/9...its--nuts.html

Has anyone seen other videos in this category?

Feel free to record your own.