My bother had a lot of friends that used to be some frat house. I don't remember which one it was, but he told me that for your 21-RUN, you're supposed to go get trashed with all of your frat "brothers" and go bar hopping all night. Then when you get back to the house you're supposed to throw all of the freshmens mattresses out the window and make them sleep on the lawn.

Well, his friend Dan got so trashed that he threw his own mattress out the window, yelled that anybody who wanted to join him could, and slept out on the lawn. He woke up the next morning and didn't remember anything from the night before.