Particularly when we are under stress, humor can be life affirming. Who hasn't experienced some "black humor" in the midst of a serious situation? Some may think this is irreverent, but I would suggest that this is one of the best coping mechanisms of the human psyche.
Laughter brings people together, it mitigates the tragic in life, and is healing. If you find yourself in a difficult place, try laughter. Watch a comedy show on TV or the internet. See how you feel after you watch it. I can almost guarantee your step will be just a little lighter.