Are you sure he was targeting the goalpost? Maybe it was a failed cross that just gone lucky. Happened to me, too.
Another example, with one of the most hilarious pieces of commentary I've ever heard:
http://www.youtube.com/watch?v=EW2d-QrnFgA
An (unscientific) study was conducted by one of the UK Sunday newspapers a few years back regarding footballers (soccer players) intellect. The conclusion was that the reason some players are so gifted on the pitch is that they are quite, ah, dense off it. Reading some quotes from some famous players seemed to back that theory up.