Hudsonhiker - should I assume you are talking about the 86 world series?
That was quite a game, although I'm not sure if it qualifies as a huge upset.
The iconic clip from the end of that game, is Ray Knight jumping high to land on home plate with a thud amidst a throng of Mets. But that wasn't the footage I like to remember - I was never a big Ray Knight fan.
On the other hand, Mookie Wilson is one of my favorite players of all time. And back in those days NBC did the series in style. Tons of camera isolating on everything. The clip I love is Mookie beating it out down to first, actually rounding towards second (not smart with the winning run approaching the plate) and then flashing a HUGE Mookie smile and breaking for home when he realized Knight was going to cross the plate.
"You just need to go at that shit wide open, hang on, and own it." —Camp