Why do i laugh at other people in pain or when i'm or anybody else is in crisis or a stressing situation i laugh. why?

Laughter: From Wikipedia :-A general theory that explains laughter is called the relief theory. Sigmund Freud summarized it in his theory that laughter releases tension and "psychic energy". This theory is one of the justifications of the beliefs that laughter is beneficial for one's health.[22] This theory explains why laughter can be used as a coping mechanism when one is upset, angry or sad. Philosopher John Morreall theorizes that human laughter may have its biological origins as a kind of shared expression of relief at the passing of danger.