Mean-Spirited Ghost

Hey listener, you slowpoke! This joke is a pun, which means it plays on words that sound alike but have different meanings. "Mean-spirited" usually means being unkind or malicious. But when you talk about a 'ghost joke,' the word 'spirited' can also make you think of 'spirits' like ghosts! So, the joke is saying a ghost joke would be mean *to* ghosts or about *mean* ghosts. Get it? You're probably still scratching your head like a dumb bear.