any mri techs wanna explain what this means

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What does this have to do with mowing lawns, Peter?

Petah?

The jar?

I need Peter's help with this one.

Is she a porn star or something?

peter please explain

Petah, why did that word ruin the dog's Scrabble game?

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