The aged FIL is taken back to hospital for a scheduled operation. He has diabetic feet and is due to have a sort of balloon inserted into an artery in one leg in order to improve the circulation. However, he insists that he doesn’t have diabetes.
“Yes you do; it’s why you have diabetic feet.”
“No, I don’t have diabetes. I just have a problem with something the doctor described as blood sugar.”
“Yes, that’s called diabetes.”
“Oh, I didn’t know that. I thought I had a problem with blood sugar.”
“Yes, you do.”
“Hah! You see! I don’t have diabetes!”
(Repeat until bored).