I will not try to direct the people around me.
I will not offer help with the (very difficult and word-filled) music unless specifically asked to do so.
I will not bad-mouth other actors (including the girl who got the part I wanted) or the director. Or anyone else.
When I think about what a lame part I got, I will think about the people who didn't even get a chance to be in the show, and just be grateful to be part of it at all.
When I get home, I will be useful and clean and pack, and not just sit around like a bum.
As much as I would like to be selfish and a diva, this is not about me at all. I'm here to support. I will show up on time, know my lines, and do what is asked of me, without volunteering in an obnoxious fashion. And do it with a smile.