Three businessmen find themselves unexpectedly stuck in a small town when their hotel is overbooked. They get in their car and drive around town looking for another lodging. After an hour or so they stumble across the only other hotel in town. They park-up and go to the reception to be told that there is only one room available and that it costs $30. They decide to take the room, pay their $10 each, and head upstairs.

A couple of hours later the hotels night staff arrives and the night manager looks through the register and sees that the three businessmen have paid $30 dollars for the room. He calls the bellhop over and tells him that, in fact, there is a special on tonight and it should have only cost $25. So he hands the bellhop 5 one dollar bills and instructs him to head upstairs and give it to the businessmen. However, on his way upstairs the bellhop decides to keep a little "tip". When the door to their room is answered, he hands them each a dollar bill and keeps the other two for himself!!!

Well here's the thing: the businessmen have paid $27 between them ($9 each) and the bellboy has pocketed $2. A total of $29... not the $30 that was originally spent. So where did the other dollar go?