That’s the first time you’ve spoken here like a true coder… the only people I have ever met with a capacity for twisting puzzles around them with ease.
Technically, you merged the two idioms – the actual puzzle, and the type of thinking it takes its name from. If I were a maths teacher that would be the sort of thing I’d encourage.

Oddly, my knowledge of geometry was somewhat lacking by the time I left school, it was only some ten years later when I set a book about the rope stretchers of ancient Egypt that I finally got my head round it.

The wikipedia entry is somewhat lacking though:
http://en.wikipedia.org/wiki/Rope_stretcher

When I first encountered the “Thinking Outside the Box” puzzle in high school, my solution was to use hyperbolic geometry and draw three parallel lines through the nine dots. My teacher said that was cheating.