My boys enjoyed testing their skill at a display at Epcott involving a
long list of colors that you were to read aloud. The stickler was
however, that each color word was written in color-and not the
corresponding color of the word. (ie. "green" was written in pink,
"yellow was written in blue, etc . ) It was a definite challenge!!
Your "left" brain was really wrestling with your "right" brain.
I think it would be fun to do with a class.