I love the Irish proverb: "A good laugh and a long sleep are two of the best cures for anything." It applies well to all situations, personal and professional.
In fact, one of THE fastest and most effective ways to defuse those emotionally contentious conversations that crop up at work is to... LAUGH! (Note: laugh with each other, not at each other.) When conflict starts, our instinct is either to:
(a) avoid it, which solves nothing
(b) dive straight in and hash