I love it when an actor known for his comedic ability shows a darker side to acting...
Pictured here is Robin Williams in One Hour Photo (2002). Movies like this, Insomnia, The Final Cut, and even Goodwill Hunting make Williams such a well-rounded actor, having been the star of movies like Good Morning, Vietnam, The Birdcage, Mrs. Doubtfire, and Patch Adams; the transition from lovable joke-teller to obsessed photo processor makes it all the more effective!
RIP sir Robin.