2009 SECT championship.
My wife was a teacher at the time, and we had planned a vacation to Orlando during spring break. I didn't even realize the SECT was in Tampa until the first game.
We didn't plan on being in Orlando late Saturday. So we win Thursday and I'm thinking, hmmm. Then we win Friday and I'm like, crap - wish we'd been able to get in town earlier and see the Saturday game. But I don't even mention anything to my wife --- don't want to jinx it.
So we win Saturday and I tell my wife we've got a change of plans. We headed over & bought some pretty good half price tickets. I'd even packed my 2002 champions t-shirt to wear just in case.
Easily a top 5 MSU sports moment of my life. Later that evening we drove back to Orlando, had a nice dinner, and the whole restaurant came outside to watch the space shuttle lift off. Even though we were an hour away it was still awesome to see. Really fun day.