cowsay

Who said you can't have fun on the terminal? The cowsay project is a well-known joke from days of old. As its author once wrote: "Enjoy cowsay for what it was meant to be: simple and silly". This is what it looks like in its original form:

If you're feeling adventurous, you can type cowsay -l and see a list of other animals that you can use. I like this one:

If you're into Linux, you'll be happy to know that the brand's official mascot is also there. His name is Tux. This is what he looks like in cowsay art:

The easiest way to install cowsay on MacOS is using the Homebrew package manager. The official repo can be found here.