As soon as they see anything with a prism an a white light diffracting into composites the thought of Pink Floyd ("Oh by the way, which one's Pink?"- Have a Cigar) immediately crosses their minds. The next thing that comes out of their mouths is "what is that album, again?" and then they consecutively blurt out "Dark Side of the moon".
In actuality, I was thinking of Sir Issac Newton's book "Philosophiæ Naturalis Principia Mathematica" where he discusses his proof that white light was a combination of primary colours. I nod my head as I realize that I can't change a successful marketing campaign.
