"Marriage is the only way to acquire property without labor."
Rich asshole Walter Matthau spends himself broke and plots to marry and murder a guileless, graceless botanist who is the heiress to a large fortune to maintain the quality of life he's become accustomed to.
This movie is extremely funny in a way that feels contemporary unlike most comedy of a similar era. Elaine May was trailblazing a style of American comedy writing that finds its heirs in The Simpsons and 30 Rock. Matthau is so fucking funny in this, just a perfect comic actor. The scene where some widower is about flop out her tits for him and he just yells "No! Don't let them out!" and runs away had me dying.