Well, I once worked on a Web App that was written in PL/SQL, that produced HTML. Every variable was named v1, v378, vT31 (yeah no order), and the whole app was in 3 procedures each 80,000 lines of code, AWFUL AWFUL CODE. Honestly the horrors. Stuff like:
if condition
do x
else
do x
I worked on it for a month and it felt like years.