As a Dutchman two classic NOS moments sprint to mind:
"Nog altijd Ligtlee. Ligtlee, waar komt de rest? De rest komt helemaal niet!" (Keirin (W), Ligtlee, gold, Rio 2016)
"Hij staat, en iedereen, en ik sta! Het is ongelofelijk!" (High Bar (M), Zonderland, gold, London 2012)
And the emotional rollercoaster that was the women's road cycling at Rio 2016, which was both a highlight and a lowlight at the same time.
For international sports, I'm thinking of Kipchoge's Berlin 2018 world record, the incredible Triathlon (W) sprint finish at London 2012 and an equally close cross country skiing sprint finish that I don't know exactly.
Then there's the many medals for Bolt, Phelps and Biles among others. There's so many incredible sports moments, I can't choose!