Naked ladies at the door! Various stages of undress, including absolutely nothing on. My response was to be cool, go into my presentation and sneak a peek when I thought it wouldn't be noticed. Usually the person would excuse themselves and come back slightly more dressed than they were.
It's funny now because my next door neighbor was one of such flashers years ago and I don't think she has realized that I have seen her in her entirety!
But how might the demonstration have gone for this one at the service meeting?