Another Goodie from Randall Munroe

[barefootpuzzle]

http://xkcd.com/585/

I'm still laughing. Primarily because the mouseover text (which you need to click on the link to see -- so go ahead, click on it first and see the mouseover text) reminds me so much of this:

Click to view

May there always be wind in your sails and ink in your pen,
the Barefoot Puzzle