Click the title (if you want to). This is a Harry Potter spoof, and I'm only going to link to this one because I watched them all and there is only the one that I think is worthwhile, and that is simply because it gets in your brain and sticks. I don't like how it ends, but I found myself lauging my head off.
Just as a disclaimer, I would rate it PG for my family; many of the other "episodes" have themes/references I would call PG-13. Too bad. Check it out at your own risk because it's worse than hearing It's A Small World. Oh. Did I get you singing that now? Sorry.