Ever seen dancers start a square on auto-pilot?

I have a question for any of you who have ever called an occasional square at a dance series where they are rare. [We might assume, for the sake of discussion, a primarly-contra series where the organizers are amenable to inclusion of squares in a program, but where most of the callers booked don't include even one square in an evening. In any case, I'd appreciate it if responders would stick to answering the question I'm about to ask, and would refrain from diverting this thread into yet another rehash of "squares vs. contras"--why you personally dislike squares, why you think "people" don't like squares, why you think mixing squares and contras is an inherently wrong-headed idea, etc., etc., etc. Thank you.] My question is, have you ever seen something like this happen? You get the dancers into squares and walk them through the figures of a dance. Perhaps you also walk them through a break/chorus figure. After the walk-through, you get everyone squared up at home with their original partners and have the band start playing. As you start calling the first moves of the opening chorus (e.g., "Bow to your partner. ..."), or maybe even as you let a few bars of music go by before you start to call, you see some of the dancers start off on their own doing something they remember from the walk-through. I think there's no mystery about why such a thing can happen: If dancers have little or no experience with squares, and if they have lots of experience with contras--where the dance almost always follows a predictable repeating pattern that matches the walk-through--then there's no reason to expect they'll magically know that squares work differently. I also think there's no mystery about finding a preventative measure: Get the dancer's attention before the music starts, and give them a succinct but clear explanation/reminder about waiting and listening for the calls because squares are different from contras and don't follow a completely predictable pattern. Anyway, I'd be interested in knowing how many of you can recall seeing, even once, something like the scenario I described above, either while you were calling or while you were at a dance with someone else calling. Thanks. --Jim