Promote your movie like Hitchcock did with Psycho

I am still wondering with my self is Mr.Hitchcock put a special policy on watching Psycho because it was needed to feel the movie fear or because he needed promotions. We know that we live in the world of the mouth but we learn also that if anything is limited edition we want to have it,this is what he did. First he screened it in some theaters then it got famous. I am listing below the regulations.

1.  Psycho need to be seen from the beginning and this is a must
You could read this regulations everywhere and people got curious just because they were not allowed to enter to the theater after the beginning of the act,at times were the publicity usually consisted on just buying tickets
and watch movies without any attached regulations

2. We won't allow you to cheat every theater manager is instructed to admit now one after the start of the   movie 
The theaters were responsible for this instructions to be followed by everyone also they put people in every exit so no one could entered or exit during the movie. This way people were told that they would live a unique experience.


I do not know if this policy would work now days because it is difficult for people not to chew or drink during the movie,it is a nightmare to get them to switch off the mobiles let alone entering in theaters accordingly a regulation,even though it is for their own pleasure.