The author produce a playable PDF, a file that can be read both as a PDF document and executed as a Windows program: https://github.com/mwenge/iatheory/releases/tag/0.1

This is polyglot program

Iridis Alpha is a classic of the 8-bit home computer era. An innovative, side-scrolling shoot-em-up for the Commodore 64 published by Llamasoft in 1985 that was notable then and now for its technical accomplishment.

IRIDIS ALPHA THEORY unpacks the assembly code of the game and pores over it in minute detail. There are also lots of pretty pictures.

Discovered in Paged Out! issue #5

My first job was a trial by fire, to this day, that codebase remains the worst and the best codebase I ever had the pleasure of working in.
[...] I hope I can share with you some of its most fun and scary stories.

I mean a database table called calendar. What did it contain? A manually filled-out calendar.
When asking our resident shaman (who went by the name Munch), he informed me that when the calendar runs out we can't login to the system.

😱