Macabre (1958)

A small-town doctor (William Prince) gets caught up in a revenge plot when his small daughter is kidnapped and buried alive as he is given a few short hours to find her before she suffocates. To cover the risk of a heart attack while viewing the film, Producer-Director William Castle provided each member of the audience with an official certificate issued by Lloyds of London to insure them for $1,000 against death by fright. The gimmick worked and Castle was on his way to movie exploitation stardom!