What goes through a door but never goes in and never comes out?
Common Wrong Answers
“A key”
A key physically goes into a lock and comes out again, whereas a keyhole itself does not move.
“Light”
While light can pass through a door when it is open, it does not go through a keyhole in the sense intended by the riddle.
“A shadow”
A shadow can appear on either side of a door but does not pass through the keyhole itself.
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