AZM Ally Elliot Fox sent along this amazingly tense animated short. From the description:

A guy is traveling in a late night Mumbai local train. The bogie is empty except for a few sleepy passengers . A man with a briefcase boards the train at a station and decides to sit directly in front of him...

There's no dialog, but the tension that builds throughout the short had me on the edge of my seat. It's wonderful work. Amazing what you can achieve with some well animated facial expressions.

From: Paranoia - The Animated Short Film