In a classroom, all at once the entire class jumps on the floor and gets underneath their desks.
In a classroom, a group of children collapse like dominos.
Someone shouts loudly, and a classroom of children drop onto the floor from their chairs
A group of students fall to the floor at the same time.
A classroom of kids are doing an exercise in which they all fall to floor out of amusement.
A class of students suddenly lie down on the floor.
a group of young students in a classroom falls to the floor at once.
A classroom of students practice emergency procedures by getting under their desks.
In a classroom, a teacher shouts and the children duck under their desks.
A classroom full of students rushes to hide under their desk when someone yells something.