Most debian users will be familiar with the ASCII “moo” easter egg in apt-get.
I have just stumbled upon a more elaborate piece of ASCII art by one Professor Toyoda Masashi who wrote a joke program to reprimand those command line users who misspell “ls” as “sl” (it happens). I installed it on my desktop because my grandson loves “choo choos”.
Give it a try, it should be available in most distros. The animation is quite good.
And yes, I know I need to get out more.