Laughing is a way of reacting to something that is appealing to you. When something is funny, you laugh. Laughing is a phenomenon that is done by everybody in the world, and you laugh more than once a day. Everyone has laughed to the brink of suffocation several times in their life, weather it would be tickling or something funny. Random laughter and giggling in some public place when you remember something funny is not too uncommon. I do not know what else to really say.