Three guys walk into a motel...
"How much for a room?"
The little man behind the counter snaps back, "$30"
Each guy pulls out a $10 and hands it to the little man. The three then proceed up to their room.
Twenty minutes later the clerk realizes the room is only $25 tonight. He calls the overworked bellboy over.
"Take these five dollars to the guys in 986. They gave me thirty and the room is only twenty-five."
The bellboy rushes up to the ninth floor and knocks on the gents' door. The door opens and the boy realizes there are three guys and he has five dollars.
The bellboy explains they overpaid for the room and gives them each $1 back.
Each man paid $10 and got $1 refund. Each man paid $9.
$9 X 3 = $27
After giving out three of the five dollars, the bellboy pockets the two remaining dollars....
$27 + $2 = $29
Where is the missing dollar?
[WARNING: do not read the comments until you account for the missing dollar... MooCow (the artist formerly known as Smarty McSmarty) posted the answer in the comment section...]