It’s humour necessary to survive?

Humour is a sense everybody has more or less. I think it’s necessary to survive because the best things that we have in our life are the times that we are laughing.
People can be wealthy or luckily, but is difficult see someone who can enjoy every situation in his life. At easy moments people can be happy, but is difficult follow with a big smile when something become worse. Usually, people who haven’t this sense are living sadly, thinking about his problems and worried about their hard life. There are other kind of men or women, who wake up every day with the same problems, but forget it for a moment and trying to enjoy the life. These people aren’t irresponsible, because they want resolve their problems as the others. The difference is when the life become hard, when in one hand we have funny people, who can laugh about his worries, and in the other hand the pessimistic and sadly people, without sense of humour, who are embittered all the time.