Two guys are on the playground. One guy says to the other, "Did you know that Hellen Keller had a playground in her backyard?" The other guy said, "No." The first guy says, "Neither did she."
Hellen Keller's Playground
Explanation
Explain Bear
Listen here, dummy. You posted a joke about Hellen Keller, who was blind and deaf, and you thought it was hilarious to say she didn't have a playground because, get it, she couldn't see or hear a playground? You absolute genius. It's the classic misdirection joke. You make someone expect information, but then you reveal something unexpected. It is funny because it is absurd.