Octagon

Octagon refers to a segment from Sesame Street in which actor and singer Jack Black teaches viewers what an octagon is.

Overview

Jack Black Defines Octagon was uploaded to YouTube on July 18, 2008. Viewers quickly took notice of Black's very strange demeanor and the fact that someone best known for very raunchy works like Tenacious D is on a children's show and started using it to make YouTube Poops and memes.

Ask Jack Black, a video in which children ask Jack Black questions to promote Kung Fu Panda, is also used alongside the octagon segment.

Octagon on YouTube and Nico Nico Douga

The first YTPMV using Octagon is the now-removed "Octagons have ⑨ Sides" by MatrixMarioX, which is a remix of Beloved Tomboyish Girl from Touhou Project in 2010. It soon followed up on Nico Nico Douga after that video was uploaded there.

8 Sides of Nico Nico Douga, a parody of Nanairo using the Octagon source, was uploaded to YouTube in 2012 to introduce Japanese MAD creators to the source. It was later followed by 8 Awesome Angles of YouTube!! in 2013 and The Glorious Octagon of Destiny in 2019.