Peeta i get the joke, but is the person significant or just a random guy?

I wish I understood this meme format

What??

What do this mean Peter

Petah I'm scared

Petah I'm scared

Petah I'm scared

My cousin sent me this. Don't get it.

petah i dont understand, why cant they change and grow as a person

Wot

Peetus, the meaning of this is required