How long do you think it took for them to figure out that if they all piled into the back they'd lift the front off the ground?
In a prior lifetime I drove a school bus. I can tell you with confidence that once they figured out they could get the front wheels off the ground it would become a regular occurrence. The little darlin's.
When my dad was in high school, 1924-1927, the school district bought a new Ford TT bus. The kid that lived the farthest out became the de facto driver. He would drop the kids off on his way home then pick them up in the morning on his way back to school. The Kid was only 15 but no one cared back then as none of the farm kids had licenses back then nor needed them.