Do you have DLS? (Delayed Laugh Syndrome)

I’m on a message board talking about an episode of “Gotham”. In the episode, there is a scene with an underground fight club. One of the crowds favorites has a signature move wherein he rips the arm off his opponent’s body, and then proceeds to pummel him with it until he dies.

As this is happening, the crowd is chanting: “Why are you hitting yourself? Why are you hitting yourself?”

Clearly, this was meant to be a “Ha Ha” moment, only except I didn’t “Ha Ha” at the time.

Fast forward a day later, I’m talking about this episode on a MB. All someone had to do was post: “Why are you hitting yourself? Why are you hitting yourself?” And I start snickering like a school boy.
Does this happen to you? I’m curious why did I not find it funny the first time but did the second time?