Because everybody's trying to figure out how to make some of that Youtube money, this is a video of a three tier, 7,000 match domino chain reaction (previously: a 6,000 match rectangle). Next week there will be an 8,000 match video, and the week after that a 9,000 match one. The week after that there won't be a 10,000 match video because there was a house fire and two people died and match chain reaction videos are now banned from Youtube. Also, don't tell her I told you this, but that thing is still 1,500 matches too few to work as my grandma's birthday cake.
Keep going for the video, which is 45 minutes long because they film until the fire goes out. I'd just watch the first couple minutes then skip around.