"Your attention please. During every suspenseful moment of the running of the motion picture ‘Macabre,’ the life of everyone in this theater will be insured by Lloyd’s of London for $1,000 against death by fright. However, even Lloyd’s of London will not grant coverage for any person with a known condition or for suicide by any member of the audience."
(called "Cave Dwellers" when shown on Mystery Science Theater 3000)