A knock knock joke.

[1] - "Knock knock."

[2] - "Who's there?"

[1] - "WooOOooOOo it's me a spooky ghost."

[2] - "Oh no! Go away from me you spooky ghost!"

[1] - "No thank you."

[2] - "Ok. Do you want a cup of tea?"

[1] - "What teabags have you got?"

[2] - "I have green te- oh wait you can't have tea because you're a ghost."

[1] - "Oh yeah..."

The ghost flies away, clearly upset.