Superstition

I have only just recently started working as a sound tech in Perth theatre and on my first show I had to walk backstage to have a small briefing session with the performers before the show. I entered through the door and started to whistle just so they knew it was just me incase they were changing or something. The performer asked me to do exactly the same thing, I had to go backout of the dressing room, turn around three times and, a little different, throw salt over my shoulder before she would let me back in. I'm not really superstitious but if it keeps the peace and my performers at ease, I can oblige.