What is 'sl' and how to install it on ubuntu?

'sl' is a fun tool that makes fun of people on linux when they make a mistake of typing 'sl' instead of 'ls'. When working in intense environment, where mind needs some small refreshments every now n then, this tool is here to surprise you with a refreshment.
Lets install it and see how fun it is:

1. Open Terminator by pressing key combination ALT + CTRL + T
2. Type 'sudo apt-get update' to update database
3. Type 'sudo apt-get install sl' to install 'sl' 
4. after installation is complete, type in 'sl' in terminator and enjoy :D