The essence of comedy is confounded expectations, and it’s true repetition can set this up, and in some cases itself be the joke, especially in standup where a comedian will stretch out a bit beyond people’s comfort zone. But it would be difficult to achieve that with Nouny McNounface at this point. Just making a callback isn’t funny. It’s only funny if it takes time to actually dawn on an audience that that’s what’s happening.

When you've heard your kid tell the same "knock knock" joke 50 times, you'll realize that repetition alone isn't enough. Repetition is an important part of humour and communication in general, but context, surprise, originality, irony, and wit matter too.