So the other day, I was at a store.
This store had a double set of doors to enter the store, with some cool bargain items between the sets of doors.
After purchasing my items inside the store, I left through the first set of doors, just as a gentleman about the age of 28 or so walked into the store through the same set of doors.
I paused between the two sets of doors to look at aforementioned cool bargain items.
About a minute later, while I was still perusing the bargain items, the gentleman with whom I had crossed paths on my way out of (and his way into) the store poked his head through the set of doors we had just simultaneously passed through and said,
"Hey, I just wanted to apologize. I didn't hold the door for you before-- I just walked through and I'm sorry about that."
I must have looked totally confused, but I think I managed a smile and a "Oh, thanks. It's no problem," or something along those lines.
Needless to say, I was pretty impressed with that guy, whoever you are. Sort of different that you made the effort to go out of your way minutes later and apologize for not holding the door, but it is valient of you to be making an honest effort to be the chivalrous guy.
So thanks random guy, for wishing you had held the door open for me. That was very nice of you.