I've been stopped by people, either to ask questions or to correct my form (one guy corrected my form incorrectly, and touched me. Hands off, dude).
I also stopped someone the other day, briefly. She was with a friend who was trying to get her to do box jumps and was literally 2 feet away from me...she was saying to her friend that she couldn't do it. I said, "I can tell you that it's about 10% being able to jump that high and 90% believing you can jump that high". I don't do it often but I faced the same box jump hurdle so I felt compelled to encourage