What's the worst code you've ever written?

Early in my webdev life I really didn't grasp the concept of GET vs POST. I wrote some really bad/insecure code which attempted to submit huge amounts of data via URL params.

Any time I've had to work on really bad legacy code where I can't confidently change any existing code, but I can pile some crap on the top somewhere if there's a problem. It just keeps getting worse and worse and worse and eventually you leave the project and somebody else takes the routine.

What's the worst code you've ever written... yet.

A SQL script that deletes all tables, views, everything.
Executed by mistake (my first days at work).
My mates pranked me.

At the beginning of my career, I was fond of one-liners and compactness, with all the disregard of white spaces, meaningful variable names and readability all around.
I don't really know if the code was either crappy, genius or average, because I had no idea of what that meant: it was completely obscure to myself in a couple of months.

My code used to look like a regular expression.

I had to store plain password in a "new" application cause in the previous application the password were stored like that.

In 2008 I participated in a graphing calculator challenge where the goal was to convert a numeric input into word form (e.g. 1002 to "one thousand two"). I didn't understand algorithms at the time, so the code was a mass of if statements determining what each part of the screen should print, rather than concatenating a string.

The screen wasn't big enough to handle output that way, so the "and" was... creatively placed.

(I still won though because my program was the fastest... turns out calculators executed loops very slowly, so my not using them gave me an edge!)

Didn’t know React but was called in to do some last minute changes which needs to be committed under a deadline.

Using location.reload() to refresh the browser after a react state change that wasn’t rendering the intended component.

Got so sick in the stomach writing it. Had to purge it from git history so it never exist. Spend the weekend learning React proper.

It felt dirty. I never fully recovered.

I once wrote a primitive ES3 lexical parser in PHP meant to filter out comments and bundle JS files (a few years before node.js was released).

It resulted in errors because it had concatenated jQuery, which used an IEFE, with another IEFE without a semicolon in between, an edge case that I had overseen during development. It took me almost 1½ days to find and fix that error.

I was a college student in my first year and I used phyton in basic programming class. It was an exam day and one of the task given was to make a triangle with "*". I didn't even know how to use a loop concept, so I used print() and spacebar a few times to make a triangle. I could say that the task was succesfully failed.