One man walks up to another and says, "Hey, did you hear about the kidnapping at Main Street?" The guy says, "No." The other guy says, "Oh, he woke up."
Main Street Kidnapping
Explanation
The humor comes from the unexpected twist. Instead of the kidnapping having a serious resolution, it's revealed that the 'kidnapped' person just woke up, implying they were sleeping rather than actually kidnapped. It's a play on expectations and absurdity.