[Craig]

Agree with the others, need to confront the kid.
Just do it in a non-threatening way so it doesn't seem hard ass. 'Hey, how's it going, I was just wondering when you would be able to pay me for the tickets?' and then wait and see what he says.
You could always say that you could use the money now, might put just a little bit of guilt on him and nudge him toward getting the money.

On another note, Seahawk, if you want to see game in Mile High stadium in Denver, I have season tickets and would sell you a game.

Craig