BOOM

A man in a white lab coat walks toward a door, opens it, and steps into a room where another man in a lab coat is present; as the door opens, a burst of white foam or confetti explodes outward, scattering across the floor, and the man who opened the door falls backward onto the floor. The scene takes place in a hallway with white walls, a glass door to the left, and a wooden shelving unit to the right.