If he's doing a product ad, he probably just asked them beforehand. Like "pretend to be surprised" maybe gave them prop headphones first. That's how 90% of these prank videos work.
There's a reason it just cuts to him already sneaking up on people. They probably did multiple takes and didn't want to have to do the whole "look! There's someone with headphones" routine before each take.
If he's doing a product ad, he probably just asked them beforehand. Like "pretend to be surprised" maybe gave them prop headphones first. That's how 90% of these prank videos work.
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There's a reason it just cuts to him already sneaking up on people. They probably did multiple takes and didn't want to have to do the whole "look! There's someone with headphones" routine before each take.