United States Marines learn their own unique combatives in the process of becoming Marines, but the atomic wedgie is a move many of us pick up in our youth. It turns out that this, the most fearsome and humiliating of all wedgies, can be just as deadly as any other martial arts move.

On Dec. 21, 2013, Marine Corps veteran Brad Lee Davis learned this disturbing fact the hard way, or at least, his stepfather did. During a fight with 58-year-old Denver Lee St. Clair, Davis picked the older man up by his underwear, and then pulled the undergarment’s elastic band all the way up over St. Clair’s head.

Unfortunately, the move killed St. Clair, which would lead to both a first-degree murder charge for Davis, and a study by the National Institutes of Health’s (NIH) first-ever study on wedgies – to figure out how the hell that’s even possible.