Once again, people saw this used in a funny way somewhere and took home the wrong lesson. Usually when it's done right, it's done to make a point, like the fact that the actor fails so badly at disappearing into the role that you never see the character because the actor is so obviously himself. Like I don't even remember Arnold Schwarzenegger's character names in half the movies he was in because you just look at him and see Arnold Schwarzenegger. If the writer spent any time or effort writing a personality for the character, they'll probably never make that mistake again, because on screen the character is just "Here's Arnold Schwarzenegger if he happened to be a spy/doctor/scientist."
So when you say, "Here's the scene in Junior where Arnold Schwarzenegger is about to give birth," it's not some forced formula joke, it's an accurate way of describing how the scene comes across to most viewers — Arnold Schwarzenegger giving birth.Caption: