Laughter can be a sign of various things, or a way of expressing a feeling but it must be triggered by an event or occurrence. It is said that when someone laughs, two things are majorly deduced from every laughter.
It is either your are laughing WITH someone who has made you laugh or you are laughing AT someone's silly/stupid attitude. So the next time someone around you laughs, try to find out what exactly His/her laughter is directed at.
Ubabuike jerry Oduada.