Peanuts by Charles Schulz for August 14, 1958
Transcript:
Linus is looking up in the sky. He asks Lucy as she walks by, "Lucy, why is the sky blue?"<br> <br> He jumps as she snaps, "Because It Isn't Green!!"<br> <br>He watches as she walks away.<br> <br> He resumes looking up in the sky and says, "That just shows how stupid I am..I thought there would be a more complicated reason..."<br> <br>
That means she doesn’t know.