Use this clip as the closing beat of a short edit, followed immediately by the reload gun effect to extend the joke without extra dialogue. Before it, a fail sound meme button works as the setup for a claim that has already collapsed.
About this sound
A 4.5-second Spanish voice clip of a man delivering the line 'te creo pero mi metralleta no' in a flat, dead serious tone. The contrast between saying he believes you and immediately invoking the machine gun makes it feel tense and darkly funny, like a polite warning that is not really polite at all.