Kiefer Sutherland is making US students sick after learning of a college drinking game related to his hit show 24.
Students must take a shot of a chosen tipple every time Sutherland's character JACK BAUER says, 'Damn it!' and when the actor heard about the game, he decided to play along.
He reveals he started saying the soft curse phrase as many times as he could - including three times in succession.
Sutherland explains, "Boom, boom, boom and that was just one scene. By the end (of the episode) there had to be 14 'Damn its'.
"I could just see all these college kids going, 'Oh f**k!'"