This is a reality video.
A guy travels in a crowded bus or subway, while talking to the cell phone. He pretends to be a mechanic working at this current time on a car and promising very early delivery. He makes noises to simulate a car in very bad condition. The hidden cameramen will register the surprised faces of the fellow travellers.
Also: a doctor in a surgery, a lawyer working on a case, a veterinary operating on a pig, a trucker driving in a remote location.