What does "the joke's on you" mean?

You think you did something funny or clever or played a joke or pulled a prank or did something to someone else. But it turns out that you are the one who does not come out ahead -- the other persond does. So the joke is on you.

Anonymous'the joke's on you'

Turnabout is fair play.

Sometimes a joke backfires, and the joke player/teller himself becomes the **** of the joke.

This applies more often to "joke" in the sense of "trick/prank" than in the sense of "a funny story."

I remember the story of the practical joker who suspended himself by a rope outside a

The clown ended the show

If you try to make someone else make silly but ends up making yourself look silly instead. The joke is on you.