So lots of people have probably seen this video,it's all over Youtube and such. It starts off with "In the spring of 1999, the Family Learning Channel commissioned animator Don Hertzfeldt to pthe Family Learning Channel rejected all of them upon review, and they were never aired..."
The commercials were never aired because the Family Learning Channel doesn't exist. I guess that's part of the joke, but no matter what you google, "family learning channel -video -nipples -promo -rejected -cartoon -hertzfeldt" for example, you only get links about this video. So that's kind of lame. The Wikipedia page also says it's a fictional network.