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They did it in what, ten minutes?
Animating takes quite a bit of time to do actually (or rather, drawing the frames). I have a simple running animation in my gallery, and it took a few days at least to complete the seven frames it is made up of.
I'd suggest drawing out the frames with a pencil and paper if you have a scanner available to you. Using a lightbox or window, trace over your first frame and change things ever so slightly, then trace over that frame and change things slightly, and so on and so forth. When you feel you have enough frames, scan them in, and use a computer program to animate them (I myself use Photoshop Elements, I'm not exactly sure of other programs that you can animate things on though).