I must do these more often, and I'll try to, whenever they occur to me.
Walking along Mercian Way, going in to Warner Close via the wee alley between the houses at the bottom of the cul-de-sac (which is where our house was/is - until very shortly when it's sold). Telling each other stupid jokes, which was our wont. John told me some, I told him the one that goes: 'Man walks in to the Dr's naked, covered in cellophane... Dr stands up shocked: "Sir! I can clearly see your nuts!". By this time we are both laughing and snorting. He tells me one, then I tell him the stupidest joke I've ever heard. Man goes to the Docs having trouble walking, admits after some awkwardness that he has some trouble 'down there'. Come along old chap, don't worry about it we all get these problems, oh I see, back end eh, well bend over. The Doctor sees a lettuce leaf straggling out of the patient's bumhole. He sucks on his teeth and looks serious. "Well... I'm afraid that's just the tip of the iceberg".
I couldn't actually say the punchline. I was crying with laughter, leaning against John, who had stopped walking and was similarly, incapacitated by mirth, snorting and gasping, with his eyes watering.