Put it at the very end of a setup, after an Awkward Moment Sound Effect and before a reaction sting, so the argument collapses into a joke. Follow it with a WTF Boom Sound Effect to sell the disbelief and close the bit.
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This is a two-second Russian voice clip saying 'potomu chto tvoya mat,' meaning 'because your mother,' delivered in a short, flat tone. It feels sudden and dismissive, turning a serious question into a childish roast in an instant. It circulates online as a meme comeback rather than coming from a film or show, which is why its timing does most of the work.