I have not been hypnotized myself, but this reminds me of a little over 20 years ago while in college, my girlfriend at the time invited me to go to Funnybone in DSM with her family. I didn't know it was going to be a hypnotist show. I think she was 21 and I was still 20 and under drinking age, so I was nervous about drinking since we were with her Dad, Mom, older brother, and older sister.
Well, sure enough my GF volunteers to go on stage to be hypnotized because she said she had been before and "it's so refreshing".
She goes up with like 7 other people on stage. They put her under, and then scurvy hypnotist dude starts asking her if she's single, she responds no, has a boyfriend. I start to sweat a little being at the table with her family...guy asks her to point to a physical feature she likes about her boyfriend....she immediately points to her crotch. Place erupts. I can feel her family turn and stare at me and I knew I could not risk making any eye contact, grabbed a beer out of the bucket of beers on the table and kept lazer focus on the stage. Hypnotist asked her if any other features and then she pointed at her butt and I at least could breathe a bit of a sigh of relief.
When she came back to the table she had no recall of being under or what she said/did, but she said she was super refreshed. Later that night her sister told her about her responses and while she kind of shrugged it off, I made a point to try to avoid her family events for awhile.