A woman goes to visit her recently widowed mother.

"Finally", she says, "I think I'm ready to hear how Dad passed away."

Her elderly mother, who loved her husband dearly, was finally ready to explain.

"Well, your poor father had a heart attack. You see, we used to have sex twice a week, and always exactly at noon".

Somewhat repulsed, but altogether confused, the daughter asks, "I'm not sure how this is relevant. Why exactly at midday?"

"Because in his old age, your father was fragile and could only manage a slow pace. So we would be ready for the church bells over the road, and timed his thrusts to the slow rhythm. Chime, in, chime, out. Slow, steady, and short".

"So what changed? Why the sudden heart attack?"

"Well, you see, we were ready to go as normal at one minute to twelve. And that's when the ice cream truck drove by..."