#1 Spelling Theater with an “re”

A true theatre person will always spell theatre with an “re” instead of an “er”. This allows him to identify any other true theatre person and separate themselves from imposters.  If you ask a theatre person the difference they will be only too happy to tell you that “theater” is a building, while “theatre” is an artistic genre. 

Furthermore, using the word theatre allows theatre people to be constantly reminded that theatre comes from Europe.  This is very important because it is required in the theatre person’s handbook that they hate all things American.