The Man Who Knew Too Much [1934]
More accrurately titled, "The Man Who Knew Too Much And Told His Wife - Who Then Also Knew Too Much - And Also A Family Friend, Who Nonetheless Didn't Seem To Know Too Much Because No One Took Him Seriously". Even with the abbreviated title, it's still a rather silly movie, like a self-parody: kidnapping and repeated threats of child murder played for laughs. Each possibility for tension or suspense is lost to wisecracks or quips. Of course Peter Lorre's performance rises above the trite banter, with that smile that sends shivers down the spine.