Ruthless People (1986)

Sam Stone hates his wife Barbara so much that he wants her dead. He's ecstatic when she's taken by a duo of kidnappers who want $500,000 ransom in exchange for her life. Fully intending to ignore every one of the kidnappers' demands in the hopes that they do him a favor and murder her for him, the two confused kidnappers have to figure out how they're going get their money, and what they're going to do with the overbearing Barbara.