Stanley Donen's 1963 romcom/thriller Charade is often called "the best Hitchcock movie that Hitchcock never made," which may be true but is always put in quotes as if it was from some official review even though no one seems to know who originally said it. Whereever the ghostquote came from, Donen, directing from a script by Peter Stone (1776, The Taking of Pelham One Two Three) and Marc Behm (Help!), manages to craft a film as suspenseful as the best of Hitchcock's work that never loses it's sense of humor.
Interestingly, Universal Pictures failed to meet the criteria for copyright notices in 1963, so the film entered the public domain upon it's release. As such it's been remade a number of times, always to less impressive results. Arguably the worst was in 2002 when Jonathan Demme (The Silence of the Lambs) remade it as The Truth About Charlie, which also functions as a tribute to Truffaut's Shoot the Piano Player, with Mark Wahlberg of all people in the Cary Grant role. Peter Stone was so enamored with the results that he refused to let them credit him as a writer. Most interestingly, the original Charade was included as a "special feature" on DVD releases of Charlie, which at the time was the only way Universal had ever released it on DVD.