(Matt edit) Friend of Freedom Penguin Michael Tunnell, has created this great shirt! Hurry, it’s available for a limited time only.
This shirt is to celebrate the proliferation of Linux throughout the computing world. Linux is so widely spread that it is very likely everyone uses it everyday, whether they know it or not. Linux powers about 80% of the Internet, 100% of Android devices (phones and tablets), 100% of Chromebooks, Chromecasts, Roku, and so much more.