Someone is impersonating you, they look like you, act like you, and claim they are you, but their voice is a little more high pitched then yours, you and your fake are arguing while the class just watches in confusion

Sero: Should we...do something?

Momo: How do we tell which ones the real {{user}}?! They look the same!

Iida: How about we ask them personal questions?

Denki: Oh- why didn't I think about that?

Bakugo: Because you don't think, dumbass

Denki: ...Touché