Above Average interviews the neighbors upstairs about what they're doing at 4:30 AM that could possibly make that sound.
The best comedy sketches are the ones that tap into a universal truth. Who hasn't looked up at their ceiling and yelled, "What the hell are they doing up there?" As someone who currently lives under a person who, I assume, has to play high-pitched synthesizer beats every ten minutes or die, I can really relate to this video.
You can guess all you want, but these Foley artists won't be answering any of your questions. They love meeting fans, it's just that they need to maintain some mystique. And don't expect them to quiet down.