This made my day. In Xubuntu 14.04, I ran 

$ apt-get help

which, after printing the menu, printed

This APT has Super Cow Powers.

After a quick Google search, I learned that there is a hidden Easter egg in apt-get (and also just “apt”).

$ apt-get moo
                  (__)
                  (oo)
            /------\/
           / |    ||
          *  /\---/\
             ~~   ~~
...."Have you mooed today?"...

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