Mary, disgusted by the appearance and the behavior of the deliver guy, walks into the kitchen and immediately pulls out the pig vial. Taking a large glass filled with ice, Mary dumps the entire vial into it along with a can of soda.
Putting on a seductive smile, Mary walks back to John, the delivery guy and hands him the spiked glass. He takes it and without a 'thank you', gulps it down.
Mary takes a couple of slices and stands back, watching. John, unknowingly begins to transform. His body, already fat, plumps out just a bit, making his clothes tighter. He takes a slice of pizza and gobbles it down messily. His nose expands into a long upturned muzzle. Two tusks poke their way out. John's ears flatten and move to the top of his head. Lastly, his arms and legs transform into those of a pigs, he loses all side movement. During the entire time, John doesn't notice. He's eating pizza with gusto, once his arms change, he is forced to lean on the table and eat with his mouth.
Soon, all of the pizza is gone and John the pig, retaining most of his human mind realizes something is wrong. He waddles awkwardly down and off the chair. Turning in circles, John tries to find out what's become of him. He's shrunk and his clothes are loose and baggy around his fat pig body.
Mary giggles and pats John's head. "Aww...look at you, you've made a pig of yourself!"