Serve It Green Side Up

A painting contractor was speaking with a woman about her job. In the first room she said she would like a pale blue. The contractor wrote this down and went to the window, opened it, and yelled out:

"GREEN SIDE UP!"

In the second room she told the painter she would like it painted in a soft yellow. He wrote this on his pad, walked to the window, opened it, and yelled:

"GREEN SIDE UP!"

The lady was somewhat curious but she said nothing.

In the third room she said she would like it painted a warm rose color. The painter wrote this down, walked to the window, opened it and yelled:

"GREEN SIDE UP!"

The lady then asked him, "Why do you keep yelling green side up?"

"I'm sorry," came the reply. "but I have a crew of blondes laying grass across the street."