The Pillow Talk phone conversation has three persons speaking.
(in decades past, I've seen older films where an optical is used [a DPM - Digital Picture Manipulator], usually to humorous effect, as the screen briefly splits, for example, from two to four to eight townsfolk speaking to one another on a phone about “the latest gossip,” but for the life of me I can't recall any of those old B&W films’ titles)
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