2018: I am playing a SEGA Genesis game from 1988 called Super Hang On, which is itself a port of an arcade game from a couple years earlier. Being an arcade port, this game has a high score screen but it's reset to the defaults every time you turn off your sega.

After getting a high score, i tell the machine my name is SEX. To my surprise it records my name as NAO instead. A couple more playthroughs confirm that this happens every single time.

I contacted the editor of Super Hang On's page on the cutting room floor wiki (which tracks easter eggs and unused content in video games) and confirmed that they were not previously aware of this.

I checked the rom in a disassembler to see if it was a bug; it explicitly checks for SEX and changes it to NAO so it's definitely intentional. It doesn't do this for any other word, either.