Place it early in an edit as the promise, before the moment the plan is proved right. Follow it later with Law & Order Dun Dun for the reveal, then DJ Airhorn when the payoff lands, so the tease, the reveal and the celebration each get their own beat.
About this sound
Sam Winchester delivers you'll thank me when it's Wednesday in a dry, matter-of-fact voice, with no music or background noise, in a clip lasting under two seconds. It feels playful and a little smug, like a calm promise that a doubted plan will soon prove itself right. The line comes from Sam in the television series Supernatural.