I have always been a big believer in the power of humour. It reduces stress, boosts the immune system and without laughter, what is life? The Pentagon appears to agree. To reduce stress, they have been sending instructors to World Laughter Tour to become certified laugh instructors. Read about it here. Doctors also agree. Even the Bible agrees: “A cheerful heart makes good medicine, but a crushed spirit dries up the bones” (Proverbs 17:22)
The guiding principal: laugh for no reason. (Note: I did that the other day while walking down the sidewalk and a remarkable thing happened, the busy sidewalk cleared as people moved to get out of my way. I almost stopped laughing when they kept pointed .. it was a bit offensive).
I find that in meetings, during presentations and in 1:1 conversations, the ability to laugh or show a sense of humour (At the right time: For example, when your boss slips and dislocates his hip, that is not a good time to laugh) is a key skill. So laugh, and if you have a tough time laughing, try getting certified (no pun intended).