I've had amazing luck in person at Nats Park. I've got at least a 66% winning percentage over about 25 games. Games I've seen have included:
Zim's walk-off HR on Opening Day.
Belliard's walk-off HR against the O's.
Dukes' walk-off walk against the Cards.
Dunn's walk-off HR against the Phils, his last HR as a Nat.
Espinosa's walk-off HR (I think against the M's, could be wrong).
Ankiel's two HR game against the Cards.