There’s a saying in Los Angeles that if you’re an actor going in for a casting director, you’ll be successful if you are:

Happy, Pretty, Busy.

The source learned this saying from his girlfriend, who was a child star in several movies in the ’90s. Whenever she went on auditions, she was coached to always be Happy, Pretty, Busy; to be as desirable as possible.

It meaning is fairly straightforward, it is a guideline to making good impressions when meeting people in the film and TV industry.. You need to be happy, so people don’t think you’re a miserable person to work with, and to show you have a positive attitude. Pretty, because you need to be good looking or you wont get cast. Busy, you always need to be coming from something important, or going to something important immediately after a meeting; because people will want you more if they think other people really want you. Also if you make a person in the industry feel like meeting them is the most important thing you have to do that day, they wont take you as seriously.