Murphy is walking through the morgue when she hears.
"…this is a fertile land, and we will thrive!"
She recognizes those lines, she thinks, and she knows she recognizes the voice; that's definitely Butters. But what is he doing? She pushes the door open, peers in.
"I think we should call it your grave!"
He's got a kidney in one hand and a… is that a lung? …in the other, and is doing voices for each, like an overgrown kid.
Butters drops the organs back into the body when he hears her giggling, but by then it's much too late.