The Man Who Knew Too Much (1954)

Hitchcock didn't make a habit of repeating himself, but that didn't stop him from bringing two different versions of The Man Who Knew Too Much to the screen: the first in 1934, which the Master of Suspense later likened to "the work of a talented amateur," and the second in 1956, which he touted as being "made by a professional." The thriller follows American tourists Ben and Josephine McKenna (Stewart and Day) who, while vacationing in Morocco, learns of a plot to assassinate the Prime Minister at the Royal Albert Hall. However, he can't turn to the police without endangering his young son (Christopher Olsen), who's been kidnapped to ensure McKenna's silence.