Delivery Man: (After dropping a bunch of things on Squidward after signing for them) Hey, my pen.
This is possibly a pun off of a scene from an episode of Scrubs. In it, a patient says to Dr. Dorean that she is ready to die. At that moment, a delivery man comes in and asks the doctor to sign for a "ton of bricks". After doing so, the man drops them on the doctor (reminiscent of the famous simile, "Hits you like a ton of bricks"). The delivery man then asks, "Can I get my pen back?"