Accidental Shutdown

Listen up, buttercup. This joke plays on the idea that Stephen Hawking, a famous physicist who used a computer to communicate due to his physical disabilities, accidentally shut down his own life by pressing the wrong button, just like when you accidentally order a large pizza instead of a small one because you can't see the difference. It's dark humor because, well, it's about someone's death, which ain't usually funny, especially to someone as smart as Hawking.