You enginerds will appreciate this video of a machine that can "drill" square holes:

http://www.youtube.com/watch?v=tqOe2In9ShQ

Who says you can't put a square peg in a round hole? Well, now it doesn't matter - just make the hole square...

Looks like a round hole needs to be made with a traditional bit? Maybe as a pilot?

Its really amazing control they have over the x-y movements at that speed! Such a simple concept, but I bet the programming took a while to work through!

Now it's time to invent the square bolt to screw into that hole!