The line comes from Anchorman: The Legend of Ron Burgundy, the 2004 comedy starring Will Ferrell as pompous 1970s San Diego news anchor Ron Burgundy. Burgundy peppers his speech with mock-biblical exclamations, and By the beard of Zeus became one of his most quoted catchphrases alongside other exaggerated oaths. Clips of Ferrell's stunned delivery circulated on forums, YouTube edits and soundboards in the years after the film became a cult comedy, and the phrase still works as shorthand for overdramatic disbelief at anything surprising.