Buster with Josephine Stevens in The Rough House, 1917
Great actors have a very noticeable presence in every scene no matter the screen time. This is usually called "stealing" the scene or show. I feel it is more a mastering of their profession. When a master is at work, in any field, it's hard to look away and an honor to watch. Buster became a scene stealer in his very first film. He had over 15 years of vaudeville behind him where, I imagine, he stole the show too. It's hard not to watch him.
Buster with Roscoe "Fatty" Arbuckle in The Butcher Boy, 1917
Sherlock Jr, 1924
Keaton's career, especially his early work, is the major cause of my Keatonholism.