Can I help you?

I'd like two kilos of eggs.

What kind?

Do you have the eggs with the red yolk?

Sorry, madam. We have stopped selling those kinds of eggs for a week.

Why?

You know, red yolk is proved unnatural. It's artificial, and may lead to cancer.

Oh, My God! That's terrible.

Yes, so they are no longer being sold.

Then give me the ordinary ones.