Who is it?

The video uses a common scenario (delivery) and subverts expectations with a prank, creating a surprising and humorous moment. The inclusion of the door alarm as a 'weapon' adds an unexpected twist.

A person is at their door, seemingly expecting a delivery. Another person, dressed as a delivery person, places a package outside the door. The first person then opens the door and appears to be attacked by the delivery person with a knife, but it is revealed to be a prank. The delivery person then places a door alarm under the door, which is activated when the door is closed.