"Well, dear, it happened while we were making love one Sunday morning."
"My goodness, Grandma, two people who are nearly hundred years of age shouldn't be having s*x!" Betty exclaims.
Her grandmother replies, "Well, dear, it's really a matter of patience and timing. You see, we pace ourselves to the sound of the church bells down the street. In with the ding, out with the dong...and we were doing fine until that damned ice cream truck came by!"