When I was in KBY, the guy who sat next to me in the Beis Medrash, Moshe*, got married. Sitting next to the guy for hours a day, I was pretty close to him, so I of course went to the wedding. It was an amazing wedding, with my favorite Jewish band, and everything was awesome.
Well, I had my pencil in my shirt pocket (where I always kept it) during the dancing. Well, dancing isn't so good with keeping things in your shirt pocket, so it fell out. I only realized when the groom, right in the middle of the dance set, found me and gave me back my pencil that he had noticed on the ground.
That concern for someone else, even at a moment that any person really has a right to be self-centered, continues to inspire me to this day.
* This blog post sat for a long time waiting to be posted because I couldn't, and still can't, remember Moshe's last name. Honestly, I always just called him "Moshe" or "Reb Moishe" or "Moshe Hakohen" so it's not all that bad that I can't remember his last name, but it's still embarrassing.