Is humour necessay to survive?

Humour is a quality which takes a lot of importance in our daily life.
For exemple, when you have sot bad experiences, different types of humour like laughing a little bit helps you a lot to forget the bad experiences, and it will help you to fell better. Also, people who tend to smile more than others seem more positive and it semms that they are the bosses of the world, because it seems like bad things can it affect them. Finally,¡ it's confirmed and proved that people work better if they are in a good mood that in a bad one. And this can be confirmed, because I've proved it a lot of times.
Although humour is a a great sense there're some situations where you can't laugh and you have to take the things serious because they aren't funny.
In conclusion, I believe that humour is essential in our life to survive, but we've to take care in some situations because it isn't always appropiate to take things in a funny way.