Magnum, P.I., Season 6

Magnum:
[narrating] I must've seen a hundred rainbows since I've been in the islands, but each one just seems to take my breath away, despite the best efforts of Mr. Corkall, my high school science teacher. He used to lecture our class on light reflections and refraction, polarization and prisms, but I knew, I knew that that really wasn't what rainbows were all about. So when I got a "C" on my midterm, Mr. Corkall told me that he was really worried that I would go through life not understanding the importance of geometric optics. But to tell you the truth, I was a lot more worried Mr. Corkall might go through life not understanding the importance of a rainbow.