SpongeBob and Patrick go to the Palace of Pranks in search of the ultimate prank, and Patrick meets Frank, the owner of the shop. When they try to buy a prank, he adveritses a box of exploding gum, a whoppe cushion, a fake dollar, and vomit (both fake and real). To their delight, the manager sells them a rare can of Invisible Spray for one dollar and tell them to make sure they don't get it on their clothes because it stains. Before they decide on their prank, Patrick remembers the fact that the paint they purchased from Frank stains clothes, and he and SpongeBob take their clothes off so they aren't stained with the invisible paint. They decide to spray a park bench and sit on it, but get in an argument over who gets to spray the bench. During the fight they end up spraying each other down until they are both completely invisible. When they scare a passerbyer by asking him what the time was, but not showing themselves, SpongeBob and Patrick decide that since the man reacte