This story is called If You’re Armed and at the Glenmont metro, Please Shoot Me. It is the top rated creepypasta with a 9.24 out of 10 and was written by Peter Frost David. Link to the pasta: https://www.creepypasta.com/if-youre-armed-and-at-the-glenmont-metro-please-shoot-me/ Link to the author’s Reddit: https://www.reddit.com/user/sarcasonomicon/