What Makes Daffy Duck is a 1948 Warner Bros. Looney Tunes cartoon, directed by the short-time director Arthur Davis, and starring Daffy Duck, Elmer Fudd and an unnamed fox. The film is notable as the fourth pairing of Elmer Fudd and Daffy Duck, the other three being To Duck or Not to Duck, The Stupid Cupid, and A Pest in the House.