If guns are featured in a movie, and someone inexperienced takes to using one (the Distressed Damsel or similar character), there's a good chance of this phrase being uttered. There are three versions:
In the first case, the character being held up might use it as a ruse to try to wrong-foot his opponent. Usually in this instance the character at gunpoint is a veteran, his savvy attitude being [...] [tvtropes.org]