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1.
This phrase was made famous by Christopher Walken in the SNL sketch "More Cowbell". He plays a famous record producer, who insists that Blue Oyster Cult increase the volume of the cowbell in their studio recording takes of "Don't Fear the Reaper".
Walken (as record producer): "I got a fever and the only prescription is more cowbell!"
by Moose Boy May 02, 2008