8. The Man Who Knew Too Much
While Hitchcock's original 1934 espionage thriller was quite an entertaining film, Hitchcock himself knew that he could top it for a new decade of audiences, and did so as a challenge to himself. In 1956, Hitchcock completely remade The Man Who Knew Too Much this time with Doris Day and Jimmy Stewart starring as a pair of parents who become involved in an assassination plot that could mean the life of their son. Doris Day and Stewart both provide remarkable performances as these two people intent on rescuing their son and stopping the plot to assassinate the Prime Minister. With incredible production values and excellent photography, Hitchcock outdoes his own source material, and even he himself admits that this treatment is the better film of the duo. The Man Who Knew Too Much 1956 is an often engrossing and underrated film in the Hitchcock legacy, and features the iconic sequence of Doris Day singing "Que Sera Sera" to her young son.