Yes, twice.
My very first (official) job. I lied on my application, saying I was sixteen (when I was only fifteen) because I really wanted the job. A year later, they figured it out and let me go.
Again, at my last FT job, over a year ago. When I first took the job, I told them I also worked PT as an adjunct college instructor, and had no intention of giving it up (as teaching actually paid much more per hour than this FT job). It was also a family run business and they had a strict “no moonlighting” policy but really wanted me for the position, so the owner agreed. Five years later, I was working days (6-days/week), teaching one or two nights, and then picked up day classes on Mondays (my one day off from the FT job). This did not sit well with the owner (especially when he asked me to also work Mondays). We argued about it numerous times and then, finally, I had a disagreement with one of the other managers (who accused me of something I didn’t do). This was it for the owner, who said I was being disloyal and asked me to go.
I was upset at first, but, turns out he did me a favor. The school I was moonlighting at offered me a FT managerial job working only 37hrs/week making almost double what I made at the family-run joint.