He follows the diagram, carefully cutting in the correct places. He removes the brain and places it in a tupperware container filled with formaldehyde. His roommate slumps forward in the chair.
He is starving. He makes a blt and a can of soup before continuing. He eats quickly. When he finishes, he picks up the brain and pats it dry. He is about to place it back in the cavity when the cat jumps up on the table, spilling his glass of grape juice all over the manual.
It does not go well after that.