I saw something similar on Reddit r/FoundPaper where a parody of twinkle twinkle little star had a hilarious divergence at the end. Not all mutations have reproductive fitness but it is fascinating to see in the wild.

https://www.reddit.com/r/FoundPaper/comments/1p7bvtz/found_n...

My wife and I had a good chuckle at these. The one we both remember is the one about Penguin losing his lollipop and buying a Milky Way.

However, we both agreed that when comparing the UK(ish) and US(ish) variants, the UK ones are much more fun and colourful: The US ones seem a little, erm, boring!

Tom Scott did a video in 2020 on the exact same subject and premise[0], and it's super interesting. I'd recommend it to anybody who enjoyed this article, honestly.

[0] https://www.youtube.com/watch?v=V5u9JSnAAU4 - Tom Scott, 'I Asked 64,182 People About “Jingle Bells, Batman Smells”. Here's What I Found Out.'

Someone should tell the author that Robin laying an egg is the source of Batman's smell.