The Man Who Knew Too Little (1997)

Wallace Ritchie (Murray) flies to England to spend his birthday with his brother, James (Peter Gallagher). James has business guests coming over and must find something to occupy his brother until dinner's over. Wallace ends up taking part in the "Theatre of Life," which promises to treat the participant as a character in a crime drama. Trouble begins when Wallace answers a phone call intended for a hitman, and is mistaken for a real spy. He becomes tangled up in a plot to kill Russian and British dignitaries on the eve of the signing of an important peace agreement between the nations. For him, it's all an act, but to the men who want a second Cold War, Wallace is public enemy number one.