Home Alone theme- booby trap your house, then when your guests are unconscious get your graduation presents out of their wallets.
Charlie Brown Christmas theme- get a poor little tree that wilts over from the weight of a christmas ornament and start singing "loo loo loo loo", dont forget to talk "waa-waa-waa waa-waa" since you're considered an adult
I'm not sure what kind of randomness you want...
..but with college students you can't go wrong with a White Elephant Gift party. Everyone brings something they own that they dont use/want (wrapped so nobody can see what it is) and names are drawn for each person to go up and pick a gift.
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