Juggling.

Cute little video of a juggler. Not quite a "how to" video, but still.

I taught myself to juggle when I was in college. During final exams at the end of the first semester of my senior year, to be precise. A pretty good way to avoid studying. I even took three oranges into some of my exams, as something to do when I wanted a five-minute break in the middle of the test.