peter, what does he want to become and why?

Pulled this off a shit posting page. I know it's science related but am not getting the joke here

Petah i don’t understand who is this man?

Petah, what does this mean

Petah, why is there a bucket?

What about it?

I cant understand this for the life of me

I don't get it peter

Petah, can you explain this meme my father sent me? I'm worried he's having a psychotic breakdown.

Petah, explain yourself right now!

Peter, what is xQc?

peta plees hell p

Petaaa what’s goin on here?