Alcoholics Anonymous Eponymous

"You are an A.A member if you say so.  You can declare yourself in; nobody can keep you out.  We just want to make sure that you get the same great chance for sobriety  that we've had.  So you're an A.A. member the minute you declare yourself."

At the start of Alcoholics Anonymous the central office pinged all of the existing groups and asked for their membership rules.  The list that came back was long.  Real long.  Nobody could have gotten in.

" . . . we would never punish nor deprive any A.A. of membership, we must never compel anyone to pay anything, believe anything, or conform to anything?"