Peter Sellers left behind a rich legacy of film work, some of which is only belatedly recognized for its genius. Especially notable were his numerous crazy accents. Though most widely known as the slapstick Inspector Clouseau of the "Pink Panther" series (from 1964 on), he is recalled by many for such earlier efforts as his triple role in The Mouse That Roared (1959) and his masterly breakthrough to the mainstream American market in I'm...