Three guys go into a hotel to share a room. The desk clerk tells them the room is $30.00, so they each put in ten dollars and go up to their room. Later, the clerk realizes he made a mistake, and the room is only $25.00. So, he gives the bellhop five dollars to take back to them. But the bellhop is a little crooked and figures they can't split five dollars between the three of them evenly, so he gives them back three dollars and pockets two. Each guy paid ten dollars and got one dollar back, so each guy paid nine dollars. Nine times three is twenty-seven, plus the two the bellhop kept makes twenty-nine. Where's the other dollar???