This is an old tale. Several folks have sent me copies. This version is from Tom Vickery.

Upon hearing that her elderly grandfather had just passed away, Katie went straight to her grandparent’s house to visit her 95 year-old grandmother and comfort her. When she asked how her grandfather had died, her grandmother replied, “He had a heart attack while we were making love on Sunday morning.” Horrified, Katie told her grandmother that 2 people nearly 100 years old having sex would surely be asking for trouble

“Oh no, my dear,” replied granny. “Many years ago, realizing our advanced age, we figured out the best time was when the church bells would start to ring. It was just the right rhythm. Nice and slow and even. Nothing too strenuous.”

She paused to wipe away a tear, and continued, “He’d still be alive, if that damned ice cream truck hadn’t driven past our home”.