No particular reason

Looking at all the bicycles parked outside, I noticed one that had this big cushy looking seat with a hole in the middle. Kinda like a donut. And it reminded me of a joke. A rather irreverent joke:

Two nuns were riding their bicycles home from the market. One says to the other, “Have you ever come this way?”

“No, I don’t think so,” she replied.

“Me neither. Must be the cobblestones.”