Back in 1986, when I started work at Apple (OS/ROM group) I had to sign the usual pile of (paper) forms, one of which was that anything that I work on is Apples. I told them I would have to have my lawyer look at it first. This took them by sufficient surprise that I was accepted as employee, but no one ever later asked me for the signed agreement.
Upon quitting less than a year later -- I hated it there, did poorly, and wasn't particularly liked I suspect -- they caught it, and withheld accrued vacation or something unless I signed it. But by then all my work was on the past and sorted out so I signed it.
I did get to work beside Bill Atkinson for 15 or 30 minutes, that was cool. As newbie I was supposed to find some bug in the timer manager. I didn't. I wow write the code that caused a floppy fo eject if pit press apple key+ 1. No, that is definitely not significant.
That was my last straight-up industry job. I fkn hated it lol.