How do I switch player control to another object?

I have a first person player escaping from a prison I want it to get to a rowing boat and on a key press the boat becomes the controllable player I also want to to the reverse?

any answers

See this question: http://answers.unity3d.com/questions/1961/how-could-a-player-or-an-object-be-moved-onto-and-inside-an-animated-vehicle