My first ride was in a Citation as C0-PILOT! I had no experience in a jet and no training in the jet. It was the, "Gear up -- Shut up" kind of experience. It was only after the flight that someone else explained about the training and ground school requirements to act as SIC. I did not take the time out of my logbook however.
I was amazed at how smooth and quiet the experience was. Props are for boats. LOL