Mr. Smith went to the Doctor's surgery to collect his wife's test results.
Receptionist: I'm sorry Sir but there has been a bit of a mix up and we have a problem. When we sent the samples from your wife to the lab, the samples from another Mrs. smith went as well and we are now uncertain which one is your wife.
Mr. Smith : So what is the problem?
Receptionist: Well the news is either bad or terrible.
Mr. Smith: What do you mean?
Receptionist: Well one Mrs. Smith has tested positive for Alzheimers Disease and the othe for AIDS and we cannot tell which is your wife.
Mr. Smith: that's terrible, what am I supposed to do now?
Receptionist: All the doctor can recommend is that you drop her off in the middle of town and if she finds her way home, don't go to bed with her.