Inspired by talk on the Nerd thread.
I'll get things started:
Ong-Bak to the Future
Crossovers
In The Fight Club Garden
No Country For Three Men In A Boat.
Kinky Das Boot
Bring It On Golden Pond
The Full Monty Python and the Holy Grail.
The African Queen of The Desert
Reservoir Dog Day Afternoons.
It's A Wonderful Life of Brian
Saving Private Ryan's Daughter
The Color Purple of Mo' Money
Young Guns of Navarone
Carry on Doctor Who
Withnail and I was a Teenage Werewolf
Shaun of the Dead Calm
Apollo 13 Ghosts
The Quick and the Dead Man Walking Tall Guy
Dirty Harry Met Sally
Canon Ball Run Fat Boy Run
International Velvet Goldmine
Rocky Beaches