Childrens’ books where animals talk while also making animal noises. My library used to do that… you could call them and there was an option to listen to a recording of a guy narrate a book for children. There was one where he would make hilarious growling sounds for a bear character and it was too funny to keep listening to.
I actually heard it in a Star Trek episode and had to go find it online to fully get the context of it. I ended up using it in my best man speech at my brother’s wedding, and a ton of people wanted to know what it was from.