I've learned this lesson for myself.
When you pull the bar on the back door an alarm goes off and the bus driver stops the bus and comes back and yells at you.
Then he kicks you off because you're too old to be on a school bus and all the kids hang out their windows and laugh at you as the school bus drives away, especially that red-headed kid in the back.
Jerk. When he dared me to pull the bar I'll bet he knew this would happen.
You get in trouble if you open the back door on a school bus . . . eh.