I'm gonna go against the grain here and say Bobby's hit on the Canadian guy doing his laundry. Not so much for the hit itself, which was pretty routine, but for the following scene when Bobby returns to his family and hugs his daughter to the soothing sounds of "This Magic Moment" by The Drifters. That whole thing was brilliantly done--superb direction and camera work--and really brought home to me the duality (and indeed, harsh realities) of mob life. I must say, I really loved that scene.

Then again, the hit on Bobby himself was pretty cool, too.