It is good enough to see at least once. The Whole Nine Yards is full of cheap laughs to make up for the lack of story. The cast was great for the conditions given to them. Everything was extremely unreal which possibly made the movie funnier.
The story goes like this. Matthew Perry plays a dentist who has a horrible wife and mother-in-law living with him to make his life miserable. The wife only stays with him because he is worth more dead than alive, and they need the money to pay off her father's embezzlement debt that he made just before he killed himself. To add to this, a famous hitman (Bruce Willis) moves in next door.
Once this peaceful dentist finds out who his neighbor is and tells his wife, she sends him to Chicago to inform a mobster who has a price on his head. There, he also gets introduced to the hitman's wife and falls in love with her. She tells him of the ten million dollars which can only be withdrawn by her signature, the hitman's signature, and the mobster's signature or by one signature and two death certificates. Then the story gets more confusing with about three unlikely 180 plot twist that make this movie less real, but still entertaining. It turns out that just about everyone involved is wanted dead by someone; somehow making a story about a bunch of hit contracts and killings funny.
The story ends with a happily ever after. If you try to think to much into this movie, it just won't work out. Therefore, you need to think of this movie as just a bunch of stupid situations that turn out to be funny.
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