Thought I would share an interesting experience from this weekend flying rides. Most Sundays I fly rides at the local glider FBO. My last ride of the day was a former military air traffic controller. When giving her the safety briefing I clearly explained the jettison handle, and canopy release lever on the Grob 103. She told me that she had been in many military aircraft could clearly see the red placard and knew not to touch the lever. I also told her we would both close and open canopy so please do not touch the opening lever, if she felt she needed to grab anything, grab her shoulder harness. We released from tow and she had wanted to try a small little tiny wing over, you guessed it, she grabbed both the release lever and jettison lever. I told to let go immediately as I stopped the maneuver as quickly as possible. Spent the remainder of the flight flying as level as possible as that was what she wanted. I was rather surprised that the only two things I told her not to touch were the first things she grabbed, and the wing over was just about the smallest one possible.