"Emotions are far more contagious than any disease. A smile or a panic will spread through a group of people far faster than any virus ever could.
When you walk into the office or a negotiation, then, wash your bad mood away before you see us. Don't cough on us, don't sneeze on us, sure, but don't bring your grouchiness, your skepticism or your fear in here either. It might spread."
- Seth Godin