This story could constitute a practical joke or a revenge. My junior year in college myself and three friends had a house and since we went to a relatively small school it became somewhat of the party house. For one of my roommates 21st birthday a friend of ours gave him a handle of the cheapest whiskey (it came in a plastic bottle and the dude that gave it to us had an entire case of these handles!) I have ever run across.
A few weeks later we had thrown a small gathering and had people in and out of the house. Well I noticed that (and I mean no offense to frat boys when I finish this sentence) some 'think you are cool trying to take our cheap whiskey'-fratboy walked outside and tried to stash our cheap whiskey to take at a later point. Little did he know I noticed this. So instead of taking our cheap whiskey back, I tell one of my other roommates and we decide to piss into the whiskey the rest of the night. When we started pissing in the whiskey there was about a quarter of the handle filled; we 'filled' it up back to about three-quarters.
After the night was over we went to check on the handle to see if maybe the fratboy forgot, but sure as shit, he didn't. The funniest part is that the next night my roommate (who pissed in the bottle as well) and I ran into him at a convience store. So we start bullshitting with him and ask him what he is up to and he says he is picking up some sour mix so him and his frat brothers can make some whiskey sours that night. Ah, didn't he mean 'Pisskey Sours."
I'm sure he laughed under his breath a little thinking "I stole your guys' whiskey", but we laughed even louder when we realized that sig-ep fraternity was about to drink our piss.
