Place it immediately after the suspicious play is shown, so the accusation answers the footage before the reaction shot. Follow it with Dun Dun Dun for the reveal, then add Vine Boom Sound to close the sequence and keep the focus on the player being called out.
Über diesen Sound
This five-second voice clip delivers the question of why someone is cheating, spoken directly to the person accused. It feels blunt and playfully confrontational, like catching a friend in the act, and it gets its laugh from how plainly the accusation is put.