Mr. Robertson gets a call from his wife's doctor's office.
"Sorry to bother you sir, but there was a little mix up at the office yesterday. We had two Mrs. Robertsons in the office with two very different diagnoses. Unfortunately, the nurse mixed up the records and we're unsure which diagnosis goes with which Mrs. Robertson. One was diagnosed with Altzheimer's and the other tested HIV positive."
"Good Lord," says Mr. Robertson. "What do you suggest I do?"
"We recommend that you take her for a long drive to the outskirts of town and let her out of the car. Drive away fast. If she comes home, don't f___ her!"