Smiles

One talent I have mastered is the ability to speak in a smiling voice without actually smiling. You wouldn't think this would be a very useful or necessary talent, but you would be wrong. And when you are tired and not very crazy about your job, which just so happens to require a nearly overexaggerated amount of enthusiasm (hence, excessive smiling and friendliness regardless of your mood), it can be an absolute lifesaver. Ask me to do it sometime, and you will be amazed.