This guy goes to the doctor for a checkup, and after some tests, the doctor comes in with a grave look on his face.
Doctor: Well, I have some bad news and some really bad news.
Guy: Well, give me the really bad news first.
Doctor: You have cancer, and only 6 months to live.
Guy: And the bad news?
Doctor: You have Alzheimer's disease.
Guy: Thank God. I was afraid I had cancer!