I know this joke is as old as the hills, but I like such jokes immensely.
The patient says, "Give me the bad news first!"
Doctor replies, "You've got AIDS."
"Oh, no! What could be worse than that?" asks the patient.
"You've also got Alzheimer's Disease."
Looking relieved the patient says, "Oh...Well, that's not so bad. At least I don't have AIDS."