"This APT has Super Cow Powers."

Easter egg in APT, used in debian based linux (that includes ubuntu) Advanced Packaging Tool.

1. Type 'apt-get help' (don't need to be root). Will return with a line saying "This APT has Super Cow Powers."
2. Type 'apt-get moo' will return with a cow drawn in ascii and message "have you mooed today?"

A cow in the terminal.