Back when I used to work at the basketball games I remember people selling tickets for conference games outside the stadium for $5 a piece.
One game I was walking up to the front doors about an hour before game time to get all the computers hooked up and ready to go and a dude just handed me 11 tickets. He said just take 'em. I was like....wtf am I going to do with these? So I called some friends and they all got drunk and sat in great seats for free.