Granted, its not the most original thing ever, but I did bust my ass on this for quite some time. Its all drawn by hand, then scanned, then colored in Photoshop, and then animated. Sometimes, it doesn't translate all that well into Flash, but watchoogonna do.
I reccommend you watch it twice. The sound matches perfectly, but if you have a slow computer, it might not be properly syncronized anymore, so I recommend you pause/play the movie to let it all catch up and go back into place. Do this at 2 mins and 4 mins in the movie, and you should be okay.