An old man visits his doctor and after thorough examination the doctor tells him: "I have good news and bad news， what would you like to hear first?”

patient: "Well， give me the bad news first.”

Doctor: "You have cancer， I estimate that you have about two years left.”

patient: "OH NO！

That‘s awefull！

In two years my life will be over！

What kind of good news could you probably tell me， after this???”

Doctor: "You also have Alzheimer‘s. In about three months you are going to forget everything I told you.”