Maybe it was only at my school but back in the days when Parka anoraks (!) were the must have winter clothing accessory and bus seats still looked something like this
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It was considered good fun to sit behind someone on the school bus and tie the adjustment strap thingy on the back of the Parka
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To the bar on the back of the seat and then when they tried to get up

- disembarking the bus at their desired stop was rather a tricky operation involving trying to remove a coat which was tied to the seat you were sitting on and then try to untie the knot whilst everyone laughed at you and the bus driver complained about being held up.
EDIT: And to anyone under the age of about 15 - this is the sort of thing we did on the way to school before Android Tablets and smart phones - we had fun!