BASIC, while not a language I'd use for any reason today, is Turing complete. You can write any program in BASIC that you could write in Rust. Of course, you'd mainly do that for the same reason you'd write something in, say, Brainfuck: mainly to see if you can. But when that's all we had, we could get pretty creative with it.

It went by previous records. I'd read something about Levenshtein distance somewhere, and implemented my own half-assed version of it that was surely slower, more complicated, and less accurate. It still got the job done, though. I showed it to a coworker, who described it as "magic", and I floated on that compliment for a long time after.

I was pretty proud of it, although the resulting QBasic code was pretty awful in retrospect. It was probably my first commercial-scale project, built with the software that happened to ship with the computer.