When Plankton insults Incidental 153, Incidental 115 takes offense and calls him out on talking to her son like that, so Plankton fires back at her. Then he comes out and says he cannot talk about his wife in such a negative matter. When Plankton calls him fat, his grandmother comes out in his defense.
When Plankton turns to leave, the truck driver and his family begin to throw rocks at him and his submarine. When they run out, SpongeBob and Patrick sell them Krabby Patties that Patrick left unattended, therefore burned, in their sub.