COLUMBIA, S.C. (AP) — The most dangerous part of playing beer pong might not be drinking too much beer.

A group of Clemson University students tested pingpong balls being used in beer pong games across campus one weekend last fall and discovered teeming bacteria. More research found that dangerous bacteria such as salmonella, listeria, e. Coli and staph on the balls end up in the beer when players make successful tosses into glasses.