Seems there's a new trend/health risk called Sack Tapping. It is, apparently, about teenagers tapping each others sacks to prove their masculinity – with the result of some losing the same in the process.

I may have some misanthropic streak, since something in me condones this behavior. Young males putting their ability to procreate on the line in an effort to achieve some sort of alpha male status is intriguing. It's like some sort of threshold has been reached that has caused the gene pool to chlorinate itself.