Buried Alive

Did you hear about the man who was accidentally buried alive? -- It was a grave mistake.

Explanation

Experiment

Explain Bear

Listen here, you're so dense you couldn't find a thought in your own head. This joke is funny because "grave" is used in two ways. First, a grave is a place where dead people are buried. Second, a mistake is serious, or "grave." So, this poor guy was buried alive and it was a grave, serious mistake, get it?