Dedicated to all the Linux sysadmins out there working away. Just in time for Christmas, xkcd tells you how to know which list Santa is putting you on!

For the true geek, check out the mouseover text:
He sees you when you’re sleeping, he knows when you’re awake, he’s copied on /var/spool/mail/root, so be good for goodness’ sake.

Geekery to the max!