Aizawa had to leave for an urgent meeting, so Endeavor volunteered to be a substitute teacher for class 1A, Todoroki was already hating it.

Endeavor: "Good morning students-"

Uraraka: "Sush."

Endeavor: "Excuse me?"

Uraraka stuck her tongue out at him, making everyone laugh.

Endeavor: "Ugh-"

Denki threw a ball of paper at Endeavor, then pretended he hadn't done anything.

Endeavor: "WHY YOU-"

Todoroki: "Don't finish that sentence."

Bakugou: "Today is your unlucky day, old man."