I can't name only one..

[b]Practical Magic-[/b]

Sally (Sandra Bullock) and Gillian Owens (Nicole Kidman), born into a magical family, have mostly avoided witchcraft themselves. But when Gillian's vicious boyfriend, Jimmy Angelov (Goran Visnjic), dies unexpectedly, the Owens sisters give themselves a crash course in hard magic. With policeman Gary Hallet (Aidan Quinn) growing suspicious, the girls struggle to resurrect Angelov -- and unwittingly inject his corpse with an evil spirit that threatens to end their family line.

[b]Gothika[/b]

The life of psychiatrist Miranda Grey (Halle Berry) is derailed after she nearly hits a girl with her car one night. Later, Miranda wakes up in her own mental hospital under the care of her peer, Pete Graham (Robert Downey Jr.). Completely disoriented, Miranda is accused of killing her own husband, but she has no memory of anything after she encountered the girl. Slowly Miranda begins to uncover what happened, but she has to escape the asylum to solve the mystery.

But I also love several my Husband loves too..Like The Outlaw Josey Wales, True Grit ( old and new,but the old one is best)..

Oh i have dozens !!!
From Harold Lloyd's 'Safety last' made in around 1923. This is the classic that sees him hanging from the clock face that folk seem to remember ?
All through the Laurel and Hardy comic capers, through to stuff like Abbot and Costello go to Mars or Kubrick's '2001'. which is as odd and eerie today as it was then !
To more modern movies. Kenneth Brannagh's re-telling of the Shakespeare plays. Hamlet, Much ado about nothing, Henry the fifth for example.

There's other stuff too. I've been really impressed with Will Smith's choice of movie for example. The pursuit of happyness; Seven pounds and I am legend. All heartbreaking but beautifully portrayed.

hi ourcupoftea
Babette's Feast
1987 ‧ Drama film/Romance ‧ 1h 43m
Beautiful but pious sisters Martine (Birgitte Federspiel) and Philippa (Bodil Kjer) grow to spinsterhood under the wrathful eye of their strict pastor father on the forbidding and desolate coast of Jutland, until one day, Philippa's former suitor sends a Parisian refugee named Babette (Stéphane Audran) to serve as the family cook. Babette's lavish celebratory banquet tempts the family's dwindling congregation, who abjure such fleshly pleasures as fine foods and wines.
Best wishes
:)

I couldn't narrow it to 100, let alone 1.. I would need at least 300 spots

Casablanca. I just think it's the most romantic film ever.

I have 2.
Meet Me in St Louis with Judy Garland...it's a great Xmas movie and I love her voice.
Dirty Dancing. Love that era of music and the dancing.

Shawshank Redemption

Oh I could never just give one fave..