Let's turn this one around, a bit. My roommate is turning 21 in a week. As a gag gift, I want to get him the cheapest, worst liquor available. Something so horrible that he won't dare touch it. I want to guilt trip him into drinking it.
If he's got half decent taste buds.. MD 20/20 or Boones Farm...
Even though I don't mind the occasional straight shot of Everclear, I still find those two absolutely disgusting...
You could get him something intended to be mixed, like Martini & Rossi Dry Vermouth. Most college folks (at least, that I knew) don't know what actually makes a martini. Tell him it's a "Dry Martini".