Array-out-of-bounds Memes

So someone built a system assuming weeks start on Monday (like civilized people do), made their `tm_wday` 1-based instead of the standard 0-based, and created a bug that only manifests on Sundays. Beautiful. Just beautiful. The code is accessing `WEEKDAYS[timeinfo.tm_wday - 1]`, which means on Sunday (when `tm_wday` is 0 in the actual C standard), it's trying to access index -1. Array goes "nope" and throws a bounds check error. The best part? This bug literally only happens once a week, making it the perfect "works on my machine" scenario. You test it Monday through Saturday, ship it to production, then Sunday morning rolls around and everything explodes. The passive-aggressive "I hope you are happy" at the end really seals the deal. Nothing says "I've been debugging for 3 hours on a Sunday" quite like that energy.