Theatrical superstitions (idea)

Two additions:

• An actor never, on no occasion, has real money on the stage. Even if money is required in the play, you'll use play money.
• No actor is allowed to be seen by the audience in his costumes before the play has started ( this is a fault often, very often done by amateur troups and semi-professionals, though I have to admit it's not ONLY superstition but also for dramaturgical reasons)