I've never seen this discussion in a forum anywhere... but I'd really like to know if there is a scientific explanation for laughing. We seem to laugh on a daily basis and me, over the silliest of things. Simple controversial use of words can trigger laughing. But it always seems that something out of the ordinary is funny, even sadistic things. Like I saw a video of this cat's head get chopped off by a sunroof (fake don't worry) it sounds horrible yet watching made me crack up.