O'Malley went to see his doctor, who after examining him, sighed and said "I've some bad news, it's cancer and you better go home and put your affairs in order".
The shocked O'Malley staggered back to the waiting room, where his son awaited the results of the examination.
"Well son, we Irish celebrate when things are good and we celebrate when things don't go well. I have cancer. Let's head for the bar and have a few pints".
After 3 or 4 pints, the mood lifted a bit. There were some laughs and a good few more beers. They were approached by some of O'Malley's pals, who were curious to know what the celebration was.
"Well," said O'Malley, "I have been diagnosed with AIDS." The friends gave O'Malley their condolences and the drinking continued.
O'Malley's son whispered "Dad, I thought you said that you had cancer, but you have just said that you're dying of AIDS."
"Yes" said O'Malley, "I don't want any of them sleeping with your Mother after I'm gone."