This is something a teacher told me years ago, and he's right:
If you're auditioning for something that you know you're never going to get—or maybe you read the script and didn't even like it, but you still have to go—if you get a chance to act in a room that somebody else has paid rent for, then you're given a free chance to practice your craft. And in that moment, you should act as well as you can.
Because when you leave the room and you have acted as well as you can, there's no way the people who have watched you will forget it.
[[James Clear]]
Source: Interview at the 63rd Golden Globe Awards (January 2006)