Is humour necessary?

I think humour has a lot of meaning in our lives because if humour didn't exist at all, maybe it would be very different. You couldn't laugh with friends and maybe life would be a more pessimistic...
If humour didn't exist we would probably never smile and I think smiling is one of the most beautiful things that we have. A day without laughing for me, is a lost day. 
Jokes are necessary in our lives, becausejokes always bring a smile to a person. On the other hand, humours it an office, in our world are some people that live thanks to humour. 
 
For this reason I think humour is necessary for our lives, because if humour dind't exist we would be very different and life would have no meaning.