Don't Bother to Knock (1961)

Overview

An Edinburgh travel agent faces a chaotic night when he misplaces his keys and his fiancé. A friend discovers the lost keys and, as a prank, makes multiple copies with his address. As he embarks on a holiday, he unwittingly hands out the keys to various romantic interests throughout Europe. Just as he gets engaged again over the phone and plans to reunite with his fiancé at his apartment, he discovers that his flat is anything but empty, leading to a series of unexpected and humorous complications.