I've had leads who decided to get to close to the next couple in front of me. So close that my heel has actually gone into the man's pant cuff. And here we have the letter 'M'. . Have done that at least twice, and the expression on everybody's face, as we all freeze, is hilarious. I'm looking at the other guy, he's looking at me like "Now what?". My partner is looking at me like I'm nuts, as I've got a death grip on them, balancing on one foot, and the other lady, is just utterly confused.