Now that I think of it, I remember having lots of fun with geometry, trying to figure things out on my own. I still remember the first time I got to prove Pythagora's on my own, or the formula for the volume of a pyramid. It felt so awesome that I still long today for a math course where you start from zero and the teacher just guides you into figuring stuff out yourself, one by one (Pythagora's, Pi, formulas for volume, etc).