Ooooh, only five? This is gonna be tough. Okay, in no particular order:
Kelly's Heroes
The Outlaw Josey Wales
2001 A Space Oddysey
Picnic at Hanging Rock
It's a Mad Mad Mad Mad World
Pale Rider
Yeah, I know that's six, but how could I leave any of them out?

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"The future's uncertain and the end is always near." - The Doors "Roadhouse Blues".