Retro film buffs and historians will want to take note of this month's Cinematheque, Marathon Branch's free weekly movie series. The theme is "Silent Scream," a tribute to silent movies and classic horror flicks. On April 18 at 6 p.m., the selection is the silent horror film "The Cabinet of Dr. Caligari." The movies are all shown on the large screen in the community room, and freshly popped popcorn will be served (for free!).