Does this ever occur to anyone else?

I haven't recently had a relative or close friend pass away, but after speaking with a friend of mine yesterday, and learning about the death of a friend of hers, I started to think; whether you got along well with a particular person before they passed or not, do you ever wish you hadn't done/said certain things to them? Do you wish you would've/could've told them something you never got the chance to tell them? Do you even realize exactly how important they are before they're gone? Another friend of mine had her brother, who was only six years old pass away a few years ago. She explained to me that although she didn't see him often as they didn't live under the same roof, the majority of her memories of her and her brother were the two of them arguing. She explained that although most of the arguments were over silly things, she wishes she had been much nicer to him. I also found out last night that a teacher my friends often took for granted during my seventh grade school year drowned earlier yesterday afternoon, while trying to prevent his son from having the same thing happen to him. But on a slightly happier note, his son did end up making it out of the river safely. Now this gave me something to think about. This particular history teacher and sports coach may have been annoyingly strict, but he died a hero, father, husband, teacher/coach, and of course a loved one too many other people. That having been said, even the most irritating people in our lives can somehow mean the most to us, but we never notice it until after we learn that we will never see them again.