Well first of all Sham, I'm not an actor of course. I get hired occasionally in plays where the script calls for a character who plays an instrument. When they've exhausted the search for an actor/musician, they go for a musician/ sort-of actor. One night during the play "Desire Under the Elms" while waiting with two others backstage for our cue, I foolishly said "When did that old superstition about "MacBeth" die out?" Both actors gave me dirty looks and pushed me through the nearest door - told me to turn around three times and ask permission to come back! We had to be on stage in about a minute and they STILL insisted on the ritual. Later they said they knew it was silly but "Why take chances?"
People are strange.