The old man waited for his Doctor to return with the results of his tests.
On his return the Doctor asked him to sit down as he had some bad news.
First, said the Doc, after your little visit to the Thai brothel we have confirmed that you have contracted AIDS, unfortunately there is no cure. Oh shit, says the old man.
Secondly, says the Doc, you have Alzheimer's but we can treat that to lessen the impact on your life.
Thank Christ, says the old man, at least I don't have AIDS.
another version of this
a wife goes to collect her husbunds test results. the doctor stops her and says they have bad news.doc" sorry man we have mixed up your husbands results" wife " wat do you mean". doc "well your husband either has aids or alzhiemers". wife "well what do you suggest i do". doc " take your husband into the middle of town and leave him there if he finds his way home dont sleep with him"
classic! love the joke man