If you're the kind of person whose anger shows on your face even when you're trying to hide it, you probably shouldn't apply for a job as a party clown.
Anger is a powerful emotion that everyone feels from time to time when someone or something frustrates or annoys them. One of the roots of anger is the Greek word ankhone, or "a strangling," which is a perfect description of the way anger actually feels. It's a painful, distressing kind of emotion.