Place this clip just ahead of the splash shot in your timeline, then follow the impact with the bruh soundboard button for the stunned reaction, and keep this as the only voice line before that payoff moment arrives in the edit.
About this sound
A short spoken clip of a voice shouting the Portuguese warning aí vem água, menino, stretched over about six seconds with urgent, exaggerated delivery. It feels funny and frantic at once, like a last-second alert before someone gets drenched, which makes the panic itself the joke for listeners who know the phrase.