Pat Summit's husband takes her to the doctor because she's been feeling strange.
After examining Pat for quite a while, the doctor tells her husband, "Well, it's either Alzheimers or AIDS."
"What do you mean? You can't tell the difference?"
"Yeah, the two look a lot alike in the early stages... Tell you what; drive her way out into the country, kick her out of the car, and if she finds her way back to Knoxville, don't fuck her."