Alf and Mabel have been married for 60 years and they live in a residential home for the elderly. One day Alf announces, "Mabel, I know we have been together for many, many years and we've been through a lot together but I'm afraid I have some bad news, I'm leaving you." "Why?" gasps poor old Mabel. "I'm going out with Vera next door," he replies. "Vera! What does she do for you that I don't?" "She gives me oral sex," says Alf. "But ... but Alfred, so do I," exclaims Mabel. "Yes," says Alf, "but you don't have Parkinson's Disease."