While walking to the checkout at Costco just now a young guy popped out of an aisle leaving his girlfriend cut off. I stopped and gestured for her to go. She did and then grabbed her boyfriend's arm and I guess told him he cut me off. They then spent two minutes apologizing and trying to let me go ahead. I told them they hadn't cut me off and to please go. They wouldn't accept that. Very polite though. I finally asked if I was that damn scary? The girl assured me I wasn't and they went.