Really Bad News

This guy goes to the doctor for a checkup, and after some tests, the doctor comes in with a grave look on his face.

- Well, I have some bad news and some really bad news.

- Well, give me the really bad news first.

- You have cancer, and only 6 months to live.

- And the bad news?

- You have Alzheimer's disease.

- Thank God. I was afraid I had cancer!