Why did Dracula lie in the wrong coffin?

Behind the Groan

A Mistake With Grave Consequences

A grave mistake is normally a serious error, but Dracula's coffin connects “grave” to burial as well. The setup gives the familiar phrase a literal spooky setting without needing a complicated story. Ask the question as though Dracula simply mixed up sleeping arrangements. Pause after “wrong coffin,” then deliver the punchline with mild seriousness so the everyday expression and cemetery meaning arrive together.