So you love cotton candy, but you are afraid to go the carnival because of all the carnies there that creep you out. Your choices boil down to going without, buying that bagged crap at the store, or making your own cotton candy machine. I recommend the latter option.
Make has a video up that shows the step-by-step guide to making your own cotton candy machine from a DC motor, 9V battery, and a pair of Snapple lids. The entire process looks pretty easy.
I never thought about how they make cotton candy, apparently you need heat. I'm also not sure if you need some sort of special sugar or if any plain old granulated, sugar will work. Check out the video below for how to build your own machine.