Green, PINK and Yellow.

One day, an english teacher explained about coluour to his students.

After he had finished explaining, he asked his students. "Who can  make a sentence using words green, pink and yellow?"

James the smartest student raised his hand and answered, "When the yellow morning sun comes, i see a beautiful, girl wearing a pink dress walking trough the green grass."

But another student, the most stupid student, Johny, raised his hand and said, "I heard the phone rings. It sounds green-green, then I pink up the phone, and say -yellow, who is speaking?"