In college I was playing Edward Forty Hands where you duct tape a forty to each of your hands until they're empty. (Makes going to the bathroom interesting)
My two mates were so pre-occupied with each other they didn't notice I was stealthily positioning myself for the highly coveted first-to-finish award.
When one of my mates noticed, he hit the top of my beer bottle which was down to its final couple of sips breaking the glass. He thought he'd bettered me, which I happily laughed at and drank the beer anyway.
How much damage was done is unknown to this day, but let's just say there was a lot more crunching going on in my mouth than your average beer.