"I edited SystemVersion.plist to make the “About this Mac” window say it was running Mac OS 69, which is the s*x number, which is very funny."

If I'd see that on my kids' computer it would fill me with pride.

I do miss the days that a (Linux) computer was like this for me. I say Linux because I had a similar obsession with FOSS and what it meant in a broad sense. But it doesn't matter, before that I de-compiled some program to make the text on the Windows START button different. Re-installed Win 2000 about every week, often after f-ing it up. Before that I changed some lines in DOS' autoexe.bat so it would ask for a password (which was just 2 input parameters readable in the autoexec.bat, but that is some mighty fine security (through obscurity) in a normie family).