If you've heard this before, or work out the answer, dont say anything. Let it annoy whoever it annoys for as LONG as possible 
3 guys go to a hotel, the manager charges them $30 to share the room. Being simple they pay $10 each, then go to their room. 10mins later the manager realises he made a mistake and the room was really only $25, so he sends the bell boy up with the $5 change. The bell boy is a lazy prick and cant divide 5 into 3 so he decides to keep 2 himself, and give them 1 back each...by now the men really only paid $9 each for the room (as they got $1 back) 3 men paying $9 each = $27. the bell boy has $2... thats $29 total, where did the $1 go?

3 guys go to a hotel, the manager charges them $30 to share the room. Being simple they pay $10 each, then go to their room. 10mins later the manager realises he made a mistake and the room was really only $25, so he sends the bell boy up with the $5 change. The bell boy is a lazy prick and cant divide 5 into 3 so he decides to keep 2 himself, and give them 1 back each...by now the men really only paid $9 each for the room (as they got $1 back) 3 men paying $9 each = $27. the bell boy has $2... thats $29 total, where did the $1 go?
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