Bill Cipher is the main antagonist of Gravity Falls, the Disney animated mystery series created by Alex Hirsch that ran from 2012 to 2016. The triangular dream demon became one of the show's most quoted characters, thanks to his gleeful chaos and reality-warping powers. As Gravity Falls clips spread through YouTube edits, TikTok and fan soundboards, short Bill Cipher voice clips became shorthand for a twist, a trick or an ominous reveal. The character's cult following has kept these tiny clips in circulation long after the finale, especially among fans remixing the show's strangest moments.