The line comes from the 'More Cowbell' sketch on Saturday Night Live, which aired in April 2000 and spoofed a Blue Öyster Cult recording session. Christopher Walken played fictional producer Bruce Dickinson, who stops the band mid-take to declare he has a fever and the only prescription is more cowbell, urging Will Ferrell's cowbell player to play louder. The sketch became one of the most quoted in SNL history, and the quote now lives on as shorthand for demanding that something be turned up past all reason.