I think it was last day of college or something. Either way, he was driving down late to meet the rest of his buddies that had gone ahead. He says he was absolutely flying, speeding way too fast and got pulled over not far across the border.

He was given a choice, go to jail or give them all the booze he had in his car (was being the bulk of the supplies for the weekend for him and his group)

The groups was pissed when he showed up sans booze