My first job out of college, my boss and I took over some code that was written by two genius PhDs (one math, one physics - we were working in finance.)
I noticed a variable (long word starting with z) used in a lot of places. Turns out it was the German word for "counter".
It was my first hint that most of the backend codebase was written as a competition between the two of them to seem the smartest.
On the front-end, I remember opening some many thousand line long file trying to figure it out. I scrolled pages and pages to the top of the file looking for a comment. I found one. The comment:
/* What is this shit? */
Written by someone who tried to help those guys.