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The Monty Hall thread got me thinking of another logic problem I think is pretty fun. I suspect it has been posted before, but I can't find it with Search.

So...

Three guys on the road stop at a cheap hotel for the night. The sign says $30/night. The guys are down to the last of their money, so they decide to share one room, each paying $10.

After they've paid their $30 and head up to their room, the manager realizes he's made a mistake. It's Friday, and the room is only $25 on Fridays. He sends the bellboy up to their room with their $5 reimbursement.

The bellboy hands them the $5, but of course they can't split it evenly, so they all take back $1 and give the bellboy a $2 tip. Pretty cool, they each save a dollar and they get to tip the bellboy!

After a while one of them, thinking there's a problem says "Wait a minute, we each paid $9, which is $27, and we paid the bellboy $2. That's $29. What happened to the other dollar?"

So, what did happen to the other dollar?