Credit where it's due: the NBC broadcast booth has a decent job of calling curling matches during the Olympics. The commentary is analytical without being confusing, and explanatory without having to oversimplify.
That said, NBC's Fred Roggin amply demonstrated on Friday night why broadcasters shouldn't pre-sell their money calls. Everyone wants their Al Michaels "Do you believe in miracles? Yes!" But nobody wants, "Do you believe in mir--okay, Russia just scored somehow, we're headed to overtime, or a shootout, or whatever."
As Canada made a potential game-winning slide against Sweden to win the gold, Roggin had such a moment. A paraphrase:
And they say there will always be tomorrow...but tomorrow...IS TODAY! ...Oh, and we're going to an eleventh end.
"Down does not go Frazier! Down does not go...oh, wait, down goes Frazier!"
And Sweden eventually wins, 7-6. We have the full results here.