C4 is a black belt in square dancing. Almost everyone who does it is a computer nerd. The learning curve is shaped like the side of a house: the first part is a doozy, straight up, and then (once you have studied enough that you can go out to open dances and actually practice) you get to go up a 45 degree incline from there.

I am somewhere between half and three-quarters of the way up the side of the house. I've tried to learn this before, and fallen off every time; I might just make it to the roof this time around.

I love it. Of course. :-)