At 20,000 to 25,000 dominoes total, what you're seeing in this video doesn't come close to the world record. But that doesn't matter, because these domino setups are incredibly involved and creative.
There's something so satisfying about watching controlled destruction. Havesh 5 and milliondollarboy spent three months on these towers and walls of dominoes, patterns, card tricks, and Rube Goldberg-type setups. Raze it to the ground. [Reddit]