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Like most husbands, Rob (Dick Van Dyke) can understand that Laura (Mary Tyler Moore) would want to stash a little "mad money" in the house just in case of an emergency. But Rob can't fathom what possible emergency Laura is anticipating when he accidentally comes across a mysterious bank account book, indicating that his wife has salted away a small fortune. The fun really begins when Rob jumps to the wrong conclusion as to what Laura intends to do with her reserve of cash.