An old man and his wife are celebrating her birthday so he turns to her and says "O.K. dear it's your ninetieth birthday so you can have what ever you like for the special day". She turns to him and says " I want you to go down on me " ."What ?" he replies,somewhat shocked at her unexpected reply,then "alright I did say anything you wanted". As he is about to go down on her she warns him "it may be a bit smelly down there,my arthritis is playing up a bit ". He looks up ," Huh,you have arthritis in your box ? " His wife looks at him and answers " The arthritis isn't in my box,it's in my wrist and I haven't been able to wipe my arse for a week! ".