Q: What do you tell a hitchhiker on leap day?
A: Hop in!

Explanation: Happy leap day, leap year day, February 29!  It’s not every year I can explain a joke on February 29!!  (Leap year happens once every four years.)

To begin with, a hitchhiker is a person who waits by the side of a road or highway looking for someone to drive him/her down the road.  Often hitchhikers will use their right thumb to show that they want a ride.  Hitchhiking is sometimes called “thumbing a ride” and it is very dangerous to do.  It is also dangerous to pick up hitchhikers if you are driving.  Please don’t hitchhike or pick up hitchhikers.

“Hop in” is a common idiom that means you can get in the car.  Leap and hop are synonyms.

This joke is funny because telling someone to hop on leap day is funny

Here is a song about hitchhiking by Vanity Fare (lyrics):

The title for this post alludes to the book series Hitchhiker’s Guide to the Galaxy.