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Doctor, doctor, I keep thinking I'm an invisible ghost.
Did someone say something?

How did the invisible boy upset his mother?
He kept appearing.

What is even more invisible than the invisible ghost?
His shadow.

Have you any invisible ink?
Certainly, sir.
What color?

Doctor, doctor! I'm becoming invisible!
Yes, I can see you're not all there.

Who was that at the door?
The Invisible Man.
Tell him I can't see him.