A joke my mother told me.

A groundskeeper in France was sweeping the driveway to an apartment building in Paris.

*Sweep* *Sweep*. *Sweep Sweep*.

So it went for about an hour, with regularity.

*Sweep Sweep*. *Sweep Sweep*.

Suddenly he came to a spot with a very annoying patch of dirt. In an attempt to get it off he began to use more force and speed.

*Sweepsweepsweepsweepsweepsweep*

Suddenly above him he hears a window slide open, and a man sticks his head out and shouts:
"Monsieur, you're messing up the rhythm for all of Paris!"