Performer's superstitions, do you know any - perhaps you have your own?

Question

Superstitions are like the soul's comfort food, especially for performers.

Do you know any Performer's Superstition?
Let's make this something that revolves around performers, public speakers etc.
Perhaps one's personal regime? If you're a performer - athlete/ actor/dancer/musician/public speaker/singer/something else do you have any practices?

One of the fun parts here would also be trying to grope for our rational excuses.

It would be lovely if we could hear how your rituals/traditions began.

And this is just for the fun of it, our irrationalities and all.
Cheers, all.

(We'll allot different questions for general superstitions and superstitions for like taking exams and things.)

Answer 1

I am a classical pianist. This goes counter to everything I was ever taught, but on the day of a recital, I will not play a note before the performance. My thinking goes that if I practice, and have a memory lapse (which I generally do not do, but they are very noticeable when it happens!), I will be worried about that lapse to the point that in the actual recital, it will happen.

Answer 2

Never wish anyone good luck - always say "break a leg"

Never mention the name MacBeth while inside a theater.