There's one of the most brilliant scenes of cinema history.
http://youtu.be/6tWKhFSwPi8
Chaplin plays dual roles in this comedy that is by no means a perfect film but contains many pleasant moments.
Chaplin plays two roles in this story driven charming short. Some wonderful moments especially out on the golf course.
The Idle Class:
Lots of great bits, of course, and a decent mistaken identity story. Not tightly structured as Chaplin's better work though.