Sometimes they get lucky

Great goal scorers have a knack for doing things just right to get the ball into the net in numerous different ways.

And sometimes they just plain get lucky.  I think this was one of those times for Didier Drogba.

If you click the full-size button on the right, it'll be a little more clear. Basically Drogba got his foot on the ball, it popped nearly straight up, but the trajectory was just right to go just under the crossbar, which was obviously a very big surprise to the goalkeeper.