Yogurt

Yogurt is an essential item for my breakfast.

One day I saw no yogurt on a shelf at the
supermarket despite a few minutes after they
are open.

I asked a clerk if he could check backyard for any.

A minute later he came back with no yogurt holding
his hands and said, "Sorry, we are out of it."

"Oh, really?" exclaimed I.

The clerk shrugged his shoulder, saying, "The supply
of yogurt is not stable at this moment."

I realized that there was a sign at the shelf showing
just what this clerk said while he was explaining.