I gave my FIL a ride at Barber Motorsports Park a few years ago. He's always been a "car guy" (American muscle cars) and was convinced he knew what he was getting himself into.
He got out of the car after the run session and simply said, "I wasn't prepared for that".
He said he spent the first two laps simply trying not to throw up and the rest holding on for dear life. I was actually taking it easy lapping 5 or 6 seconds a lap slower than typical.