[Duncan Gillies MacLaurin]

I've one that's the same as one of yours, Brian (True Git). I think it's about avoiding the obvious ones. I thought of Lice in Wonderland, but discarded it as being a bit too obvious. Notes on a Sandal likewise. Anyway, here's what I came up with:

O Bother, Where Art Thou? – The humorous adventures of an absent-minded 19th-century intellectual, Gussie Merry-Maitland.

Petty Woman – No piece of trivia is too small for our heroine. Comedy/quest at its best.

Owl – Shy (and gay) academic poet, Alwyn Guinea-Burr, takes to the poetry circuit like a duck to water. A real hoot!

True Git – Is this comedy or social realism? Whatever.

The Big Nose – Starring Gérard Depardieu.

The Trouble with Pies – What’s in those pies anyway? Journalist Crispin Rye goes undercover to find out.

The English Patent – No one is quite as good at Englishness as the English. But is it something others can acquire?

A Moth in the Country – The beauty of a single moth inspires a young man to lay aside his traumas.

Duncan

[Brian Allgar]

Duncan, I'm sure many people will come up with the obvious, so it's more a question of the accompanying comment.

As to the titles, I wonder if we ought to identify the original? I say this because you have three that I don't recognise (probably because my film-going has become much more sporadic than it once was):

Owl
The Big Nose
The Trouble with Pies

[John Whitworth]

Do you know, Brian, they're all winners.

The Ladkillers: The Secret life of A.E. Housman and W.H. Auden
No Way to Treat a Lad: More of the secret life of A.E. Housman and W.H. Auden
The Big Hat: Quasimodo in modern dress
In the Hat of the Night: Jack the Ripper IS the Prince of Wales
The God, the Bad and the Ugly: Richard Dawkins - the Musical
The Cunt of Monte Cristo: I haven't really thought this one through but it stars Gerald Depardieu
The Big Cock: And this one stars Errol Flynn
The Kin and I: Margaret Mead finds Love on a Tropical Island. Starring Ingrid Bergman and Stepin Fetchit

[Jayne Osborn]

Brian, Duncan and John,

Excellent ones, from all of you. I'm still thinking...

Brian, I'm guessing that Duncan means The Big Noise, The Trouble with Spies and Howl.
Get on to "IMDB", the Internet Movie Data-Base - almost as invaluable as Google!

Jayne

[Lance Levens]

Tar Wars: two sides fight over cosmic black gluey stuff that holds the universe together.

Madame Ovary: an animated epic war, starring Madame Ovary, mastermind of the female reproductive system and Mister Semen, her arch nemesis, mastermind of the male reproductive system. At stake: the continuation of the race.

The Great Rain Robbery The evil fitness guru and ruler of the Guttural Race, Dr. Angela Murky, devises a scheme to withhold rain from the Mediterranean countries--unless they agree to trim their budgets.

Eat of Eden: Based on H.P. Rowland's rewrite of Genesis in which God renounces the antiquated idea of sin and invites all living creatures to "Eat of Eden!"

[Jerome Betts]

Tar Wars: eco-campaigners versus oily magnates in Canada

Oops! Lance beat me to it.

[Lance Levens]

John

The Kin and I!!! Help me I'm falling out of my chair.

[Jerome Betts]

The Best Ears Of Our Lives: gory story of Spanish toreros of the Golden Age

A Clockwork Range: drama about race to market a Christmas toy in the pre-electronic age

City of Go: intrigue in the cerebral world of propfessional Go-players

One With The Wind: competitive gliding bio-pic with breath-taking in-soar backgrounds

The 400 Lows: saga of an English summer

The Princess and the Fog: saga of an English summer Part Two

Abe: President Lincoln as you never saw him before

Ad Boys: sex and shenanigans in a cutting-edge agency

The Ion King: rom-com in a physics research institute

[Jayne Osborn]

Now White and the Seven Dwarves: Michael Jackson’s last film

Invasion of the Boy Snatchers: A terrifying film featuring extra-terrestrial paedophiles.

Pup Fiction: The drug-ridden prequel to The Dogs of War.

Rainspotting: The blockbuster British release from the summer of 2012!

Shat: A street-wise but incontinent private detective, played by Richard Brownlog.

Goo Morning Vietnam: Motormouth DJ struggles with conjunctivitis in South East Asia.

Our Weddings and a Funeral: Elizabeth Taylor’s tribute to Richard Burton.

Yes Wide Shut: Incomprehensible swansong to the oeuvre of Stanley Kubrick, who died within days of the film’s completion.

All Quit on the Western Front: A poignant tale of mass desertion during the Great War.

Rebel Without a Case: The dramatic story of a teenager whose luggage goes astray.

[Roger Slater]

Lots of funny stuff, but they aren't quite "plot summaries," are they? Though I suppose they still qualify, and what counts is being funny.