If you find your ball in the woods, it is unplayable. If a professional finds his ball in woods, not only is it playable but he can hit it onto the green.

Sam and Harry are playing one day. On the first hole, Sam hits a wicked slice into the adjoining fairway. The ball hits another player right between the eyes and he drops to the ground.
Sam and Harry rush over to the prostrate man and find him unconscious with the ball laying on the ground between his legs.
Sam screams, "Oh my God, what should I do?"
Harry replies; "Don't move him. If you leave him there he becomes an immovable obstruction and, according to the rules, you are allowed a drop two club-lengths away."
Pot Trophy 2011