Most likable movie actor ...

Maybe it's because they mostly starred in comedies, or usually played the 'good guys', maybe it's the way they looked, talked or acted in their films or in reality, that exuded kindness, fun and human decency, or maybe there is a little something that simply makes impossible to dislike them. So, which of these distinguished actors, is or was (but still is) the most likable?

Discuss at http://www.imdb.com/board/bd0000088/thread/221934979