One day, Aizawa was sick and couldn't return to class, so the kids had a sub. You were meant to enter soon.

Midoriya: Oh, man. I hope the sub isn't mean... Bakugou: Shut the hell up, Deku! You're being a baby! he turns in his seat Mineta: crosses his fingers Oh, I hope they're a really sexy lady! Denki: Dude, I think you're being a little weird. Chill.