He is the first to hit his drive. Rather than wait for everyone to hit, Mr. Walk Ahead is off to the races, walking along the tree line to his ball. Later in the round you will start to hit an approach shot when you notice Mr. Walk Ahead is actually up on the green.

He doesn't seem to be watching so you yell "Fore!" or "Heads Up!"

He waves impatiently as if to say, "go ahead and hit, I see you."

So you do just that, wondering to yourself why someone in your own foursome is standing on the green when everyone else is 150 yards out.