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That sounds easy enough. But what about nudity or # of young women? Formula’s outdated already!
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Stanley Kubrick’s The Shining, starring Jack Nicholson, has been named the perfect scary film, according to a new mathematical formula.

The secret of making a scary movie has been calculated by university experts.

(es+u+cs+t) squared +s+ (tl+f)/2 + (a+dr+fs)/n + sin x – 1.

Where:
es = escalating music
u = the unknown
cs = chase scenes
t = sense of being trapped
s = shock
tl = true life
f = fantasy
a = character is alone
dr = in the dark
fs = film setting
n = number of people
sin = blood and guts
1 = stereotypes

http://news.bbc.co.uk/1/hi/entertainment/film/3537938.stm