Does it make sense? In some cases, our laughter with others might be the result of some peer pressure or imitating others. I don't think it's always the honest expression of your emotion.
mo44)Dr. Robert Provine, who wrote an article on laughter, believes humans laugh primarily because it serves as a kind of “social glue” that keeps people connected to one another. We laugh with others because it makes us feel a bond with them and that bond in turn gives us a sense of trust and comfort. No matter how hard we try, we are unable to make ourselves laugh. Consequently, when we laugh, others can be certain that it is an honest reaction, and honesty is key when building and maintaining friendships. Since laughter is seen as a social cue that we send to others, it can also help explain why it spreads to others. Studies have proven that when people see or hear something funny, they are 30 times more likely to laugh when they are with others than when they are alone. Wanting to be accepted by others is part of human nature. Nobody wants to feel left out, and is a way to signal to others that you feel the way they do, which makes us feel more bonded to one another. The brain realized this a long time ago, and group laughter has occurred ever since.