Truth be told, I often hate using this phrase myself because it's well ... just so overused -- and YES, I'm kicking myself even as I type this. :)     But since this seems to be the popular expression for merely thinking differently, I actually feel "stuck inside the box" every time I use it. Anyone else?
Anyway ... enjoy this short video.
Bonus: Here's a related photo I capturea a few years ago on building a box to think outside of.
PS: Thanks Matt for sending this. You were right, it made me laugh.