Goofy Math Riddle

[Kurn, son of Mogh]

This one tends to stump normal, ostensibly intelligent people. I suspect, however, that the denizens of this swamp will nail it quickly.

3 guys check into a motel. The desk clerk says the room is $30, so each guy hands him a $10. The 3 guys go to the room.

A bit later, the manager sees the registration and tells the desk clerk he made a mistake and the room is only $25. desk clerk takes 5 $1 bills and heads to the room. The 3 guys in the room thank him, each takes $1 back and gives the desk clerk a $2 tip.

Now each guy spent $10 - $1 change = $9 x 3 = $27 + $2 tip = $29

Where's the other $1 go?

(note): please take any speculation on what the 3 guys are doing in one room over to the *homosexuality* thread [img]/images/graemlins/smile.gif[/img]