Memory charm?

I've heard people say before that their mother never yelled at them. Do you think that is really possible or just that kids don't remember it? I'd like to say I never raise my voice but after a few days of irritation simmering inside I burst and out pours everything I meant to say in a quieter voice. I admit it is one of my least favorite traits and as much as I try to work on it, I just can't seem to add anything to my simmering pot that keeps it from boiling over. Don't get me wrong, I'm not talking about extreme yelling here, but I wish I could reason with my kids in a whisper no matter what happened. For example, two of my boys were taking a shower as I got my baby dressed. All of a sudden I hear a loud thud and the little one sounds like he is crying while drinking a glass of juice. Of course, I run in and my oldest son is holding onto the younger one and they are both lying on the bottom of the shower. Surprised by the fall, my oldest wouldn't let go of the other one. So I yelled at him to let go. As he came to his senses and finally let go, he began to cry and explain that he didn't mean to grab his brother as he was falling. By now I feel terrible and try to calm them both down as I wrap them in towels and hug them both. Is this just me or does anyone else suffer from a boiling pot? Now that I think about it I don't remember my mom ever raising her voice. I may be on to something here. I can only hope that the memory of my occasional voice raising will be forgotten along with all of the times I ask them to clean their rooms.