[He snorts a muffled laugh at the pun, pulling back as the handshake ends, and giving the vending machine some serious stink eyesocket.]

It doesn't seem to... It's a very contrary vending machine. You're supposed to pay them for goods and services, but this thing! If you try giving it a rock, it runs off!

[There's a reason it's spitting its vials at them from a distance, the better to stay away from Papyrus.]

It could stand to take lessons in salesmanship.