Maybe if I write it down, I'll stop giggling...
T: How's it look in there?
C: Well, the blue lights are blue, and the red lights are red.
T: And the green lights?
C: They're black.
*pause*
T: Okay, when the red lights turn black and the green lights turn green, push the button.
C: Okay! *another pause* Um, what about the blue lights?
T: They don't matter.
C: Well, the blue lights are blue, and the red lights are red.
T: And the green lights?
C: They're black.
*pause*
T: Okay, when the red lights turn black and the green lights turn green, push the button.
C: Okay! *another pause* Um, what about the blue lights?
T: They don't matter.