“Joker” will become the first R-rated movie in history to earn over $1 billion at the global box office on Friday. Joaquin Phoenix’s twisted take on the Batman villain marks the seventh movie this year (and first that’s not from Disney or Marvel) to join the elusive billion-dollar club. Among Warner Bros.’ movies, it’s only the fourth to reach that milestone after “Aquaman” and fellow Batman films “The Dark Knight” and “The Dark Knight Rises.”