An invisible man is here to see you
Nurse: Doctor, there is an invisible man in your waiting room.

Doctor: Tell him I can't see him now. Next.

A Short Time to Live
A man hasn't been fealing well, so he goes to his doctor for a complete checkup.

Afterward the doctor comes out with the results.

"I'm afraid I have some very bad news," the doctor says. "You're dying, and you don't have much time left."

"Oh, that's terrible!" says the man. "How long have I got?"

"Ten," the doctor says sadly.

"Ten?" the man asks. "Ten what? Months? Weeks? What?!"

"Nine..."