Not me, but a friend at college. They were shooting The Exorcist on a nearby college campus around 1977. A college friend of mine signed up to be an extra. He’s actually in the movie for about 2 seconds, when the priest is walking down the campus steps – my friend is in the background on the left.
He made about $120 for about three hours work, which in those days was a lot of money. He loved the experience.