Red Foreman is the strict, exasperated father at the centre of That '70s Show, the American sitcom that ran from 1998 to 2006, and his threat to put his foot in someone's ass became one of his defining catchphrases. Played by Kurtwood Smith, Red used the line whenever Eric, his friends or another character did something foolish, and fans quoted it long after the show ended. Clipped from the series, the line now circulates as a short reaction sound for videos and memes about bad choices, stubborn behaviour and deserved scoldings.