I stumbled across this video a few weeks ago, and immediately dismissed it as a hoax. Last night, we crossed paths again and this time I looked at it more closely and decided that it might be legitimate after all. It shows a German musician / DJ at a dance who gets a Shure SM58 microphone thrust down his gullet by a dancer who bumps into a poorly placed microphone stand.
After the microphone gets lodged in our hero's throat, the mic is still hooked up, and you can hear the poor guy's retching and gagging amplified through his PA setup. Download mpeg video (2 megs) or youtube it. The moral of the story is: never extend a microphone boom into a dance floor.
We have lots of SM58s lying around here if anybody cares to experiment on the anatomical implications of all this.