A lot of these from years past have made it in to the Linux package “fortune”. If you pipe fortune in to the program “cowsay” you can have a cow tell you a short silly comment. On all my computers I do this in the .bashrc so it happens on every new terminal. Highly recommended.

sudo apt install fortune cowsay

Then edit ~/.bashrc Add the following line to the end of the file:

fortune | cowsay

Enjoy!