The $30 Hotel Room
Three men go to spend the night at a hotel. They pay for a $30 dollar room, each giving $10 for their share. When they go to their room, however, the manager realizes that the room is on sale for $25, and gives $5 to the bagboy to return to the men. The bagboy goes to give back the five dollars, and when he does, the men take it, but give the bagboy $2 as a tip, thereby keeping one dollar each for themselves. However, one of the men is disturbed, remarking, "Hey, we each spent 9 dollars just now, since we got one back, which means $27 total, right? Plus the $2 we gave the bagboy, that's only $29! Where's the extra dollar?
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