An interesting sudo feature is the ability to insult you when you type a wrong password. It has really funny phrases, see some of them:

I’ve seen penguins that can type better than that.

Maybe if you used more than just two fingers…

On Ubuntu, this feature comes disabled by default. To enable it, edit /etc/sudoers file and put “insults” word in the end of line “Defaults…”. That line will look like this:

Defaults !lecture,tty_tickets,!fqdn,insults

That’s it! Just run the sudo command and type a wrong password.