eXistenZ - a woman introduces a stuffy, straight-laced young man to the world of video games
(Tobe Hooper’s) The Texas Chainsaw Massacre: A group of teens trying to fill up their gas tank end up spending some time with a quirky local family.
(even though the title sort of gives it away.)
Dr. Zhivago–Stereotypical soap opera plot about a doctor with a pregnant wife and a nurse whose husband is away on business having an affair.
Repo Men - Deadbeats given 90 days to pay past-due balances on financed goods are met by trained professionals who return the products to their employer.
A Few Good Men - Faced with insufficient evidence to win his case, a desperate Navy officer resorts to dirty courtroom tricks to get his accused murderers acquitted and a respected Marine Colonel put behind bars.
The Lion King - A young lion, wrecked over the guilt of killing his father, returns home years after running away, only to help kill again.
Beauty and the Beast - An uppity young woman attempts to commit an act of bestiality while a town-admired paramour courts her.
(Sorry for resurrecting this older thread but I just had to contribute when I found it) Hope you enjoy 
What you’re saying is basically swap in the descriptions of Wedding Crashers for High Noon. That would work pretty well.
Change this to…
The Lion King - A young lion, racked with guilt over the killing of his father, returns home after years of running away only to help kill his uncle.
Strangers on a Train – two strangers meet and chat on a train.
Jaws – families spend a holiday weekend at a beach resort town.
Rear Window – shut-in turns Peeping Tom.
The Birds – birds migrate in unusual directions.
Serenity: How a precocious girl overcomes various obstacles to become a pilot.
From Here to Eternity: Adulterers, bugler and his hooker girlfriend enjoy Hawaii until awakened by air traffic.
The Human Centipede – a German doctor helps visiting foreign tourists get together.
The Lorax – A young man learns the history of his town and plants some trees
*The Hunger Games – Young people learn the Thrill of Victory and the Agony of Defeat in competition.
The Avengers – A man with Anger Management issues, one with a Heart implant, a WWII veteran, and two government employees help a foreign visitor deal with his troubled brother and learn the value of cooperation with each other. Then they go out for dinner.
They Shoot Horses Don’t They? - The Hunger Games, Depression-Era style.
Avatar: a young man, who blue out his legs, regains confidence by wrestling the wildlife.
how about this summary for 20,000 leagues underthe sea: sea monster rescues castaways
alien plot summary: teamsters make unscheduled pickup
psycho plot summary: son gives mommy new start in life
life is beautiful plot summary: father and son to go camp together
independence day plot summary: computer geek and stripper’s girlfriend become home invaders
how about this for xmas story: furnace repairman gets a leg up during holidays
how about this: chicken gunslinger wakes up inside the film, inception
how about this: blue man group takes on home invaders
dirty dozen: parolees break up party
I Know What You Did Last Summer - a group of friends are brought together again and learn about life and love from an old acquaintance.
Valentine - a group of friends are brought together again and learn about life and love from an old acquaintance.
Sorority Row - a group of friends are brought together again and learn about life and love from an old acquaintance.
I Still Know What You Did Last Summer - a group of friends are brought together again at a tropical resort and learn about life and love from an old acquaintance.
Lord of the Rings - Over-long tale about remorseful thieves returning some jewellery to its rightful owner