Place it right after the reveal or fail in your edit, then follow it with a funny ha ha laugh for a lighter payoff, or let a yeah reaction button echo it when the shock turns into agreement among friends.
About this sound
This is a short spoken clip, just over two seconds long, of someone saying the British expression oh my days, the equivalent of oh my goodness. It lands as pure disbelief and amused shock, the kind of stunned reaction you give when something is too ridiculous, lucky or unexpected to process straight away.