i went super deep on 140-byte code golfing[1] back when twitter was taking off, and it changed the way i think about code. for a brief while we had a small community collaborating on byte-squeezing techniques[2], and i was constantly amazed at the creativity that this constraint brought about, from mandelbrot renderings to sudoku solvers. possibly the best part was more than a decade later when i found my golfed UUID implementation[3] deep in my employer's codebase.
[1] https://youtu.be/JsAetmgJRss?si=AxIFySX7ktzu5GL5&t=193
[2] https://github.com/jed/140bytes/wiki/Byte-saving-techniques
[3] https://gist.github.com/jed/982883