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In "Funny Games" kind of.

Does Wargames (83) count?

'Let's play Global Thermonuclear war'

'Fine...'

SPOILER...war was averted
In this sort of case I don't think it's cheating
Can't think of any examples where a weapon was prominently displayed or mentioned and then not eventually used

I thought Chekhov had a phaser like the rest of the crew? :-)