Bart wasn't allowed to use super speed at school. He wasn't allowed to use super speed at school. Bart wasn't allowed to use super speed at school. And it was times like this when that rule really sucked.
Bart was standing still in the middle of the hallway, watching a backpack swing up and around towards his face. Normally, he would have moved out of the way to keep from getting hit by the bag but he wasn't allowed to use super speed at school, and besides that, if he moved the backpack would likely hit Megan. So Bart stood still and waited for an eternity for the backpack to hit him.
"Ahhh..." He feigned, trying to act surprised and put a hand up in an attempt to protect his face from the slow motion impact. For the next few seconds, Bart pretended he was filming his own action movie. It lasted the full two hours in his mind and was just one kid getting smacked with a backpack and running through every facial expression he had.
He dropped the act when the perpetrator spoke up. "It's cool. Hi I'm Bart. This is Megan."