I've tracked that down as the first F1 race I ever saw, and it was only due to two complete coincidences.Canada 1990.
Stefano Modena has just been lapped by Nelson Piquet at the hairpin, and the image cuts to his onboard camera.
Murray: "And you look straight down the exhaust pipes and see that firey red flame of Piquet's Ford V8 engine's spent gases..."
(one minute later)
James (unable to restrain from laughing) : "Sorry Murray, I'm sure that the red flame was the rear light!" (laughs)
(and, indeed, it was the rear safety light on the B190 Benetton...)
Sundays would never be the same again...