英语脑筋急转弯:Green Side Up!

A painting cotractor was speaking to a woman about a job. She sad she wanted the first room a pale blue. He wrote it down, went to the window opened it and yelled "GREEN SIDE UP." They walked into the second room and she said she wanted it a soft yellow color. He wrote that down, went to the window opened it and yelled, "GREEN SIDE UP." The woman was curious but didn't say anything. They walked into the third room and she said she wanted a warm rose color. The painter wrote that down and went to the window and opened it, he yelled "GREEN SIDE UP." Finally the woman asked, "why do you keep yelling that out the window?" "I'm sorry," he replied, "but I have a crew of blondes laying sod across the street.