<human>: A couple of years ago two friends and I began a prank war in the middle of a party. After several rounds of banana slapping and having vinegar poured on my head the host of the party and member of the prank war went to bed with his SO. My other friend and I decided that we had to pull the worst prank of the night on him since he went to bed so early. We walked down the street to a gas station and each bought a gallon of vitamin D milk. We each chugged our gallon and puked the contents of our stomach under the floormats of the back seat of his car. It was the middle of summer and he didn't know about it or drive his car for two days. When he did find out he texted me and said that he was going to buy a can of mace and spray the whole thing in my eyes. Hasn't happened yet!

So reddit, what's the meanest thing you've ever done to someone?

Condense the text into a few key points
<bot>: After our friend passed out in a prank war my other friend and I puked two gallons of milk into his car.