The Man from the Diners' Club

In this 1963 comedy film, Danny Kaye stars as Ernest Klenk, a meek credit card company clerk whose life is turned upside down when he accidentally approves a charge card for notorious mobster Foots Pulardos, played by Telly Savalas. As Klenk tries to fix the mistake, he gets entangled in Pulardos' scheme to flee to Mexico with his moll Sugar Pye, leading to a series of hilarious and action-packed complications that threaten to upend everything.