12 seventeen year olds in one room is probably never a good idea.
12 seventeen year olds with several bottles of beer and alcopops is probably worse.
Add a bottle of whisky, and then it gets messy.
Messy like you have to remove all the furniture from your living and dining rooms and mop the floor down kind of messy.
At least it was only one of them. But jeesus, i have never seen so much sick in my life. He was legless, literally.