And predictably, holes in the story start to surface. My money is still on he got blitzed, wandered outside, and came across the wrong characters. Now maybe he was looking for a bj, a score, another bar, etc., who knows. Between being blitzed and getting his ass kicked, I'm not surprised if he's confused and wrong about the particulars.
What I don't buy is someone drugging him in the bar and hustling him out the door when his friend wasn't looking. The FBI stuff is a little weird, but he's a dumbass Aussie golfer, not an expert on who investigates what in America.