Hmmm, hard choice. But I would say "Unbreakable" by Bruce Willis and Samuel L. Jackson.
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I thought it was only one choice, so let me put them in order.
Comedy :
A dog's breakfast.
Sci-fi:
Lost in Space. (1998 film)
Galaxy Quest.
Western:
The Good, The Bad And The Ugly.
And that's it for now. 
_________________
From childhood's hour I have not been
As others were; I have not seen
As others saw; I could not bring
My passions from a common spring.
Last edited by Nagy on 04 Nov 2010, 6:59 pm, edited 1 time in total.