I can't find a video for it, but week 2 against Tampa Bay, we had a blown coverage in the secondary and it looked like TB's WR was off to the races with no one in sight to tackle him.
Out of nowhere, you see Malcolm Jenkins hustling down the field and tackling the Tampa Bay WR at the one yard line. Our defense then had a goal-line stand and that turned the tides of that game.

Yea that was last year though.. Still a great play... http://m.youtube.com/watch?v=m1wNQou3cW4