I'm with Stupid

"I'm with Stupid" is a SpongeBob SquarePants episode from Season 2. In this episode, SpongeBob pretends to be stupid to make Patrick look smart in front of his parents.

Plot
SpongeBob, hoping to go jellyfishing with Patrick, finds him frantically cleaning up his home and making furniture out of sand. In distress, Patrick informs SpongeBob that the following day is Starfish Day, and his parents are planning to visit. Patrick sadly reveals that his parents consider him to be quite unintelligent, and he can't bring himself to face their condescension. Patrick and SpongeBob come up with a plan: SpongeBob will act like an idiot so Patrick's parents will see their son as comparatively smarter, which Patrick readily accepts.

The next day, a married starfish couple arrives at Patrick's house, and Patrick thinks they are his parents. Patrick shows them inside his house, where they proceed to treat him like a child after he brings them drinks. SpongeBob soon makes his entrance, wearing his karate helmet to look stupid and acting in a strange manner. As Patrick's parents look upon SpongeBob's peculiar antics, they start to give Patrick a lot more credit for keeping his supposedly stupid friend in check.

At dinner, as SpongeBob's shenanigans escalate, Patrick begins to lob personal insults at him for his parents' amusement. This annoys SpongeBob so much that he brings Patrick to the kitchen to talk. As it turns out, Patrick has begun to forget that SpongeBob is only pretending to be an idiot, now believing that SpongeBob really is stupid.

SpongeBob confesses to Patrick's parents that he is not really an idiot and was only behaving like one so that they would appreciate Patrick more. This also fails, as Patrick's parents think that Patrick coached SpongeBob into mimicking basic skills such as talking in complete sentences and even math. Their derision and laughter brings SpongeBob to the limits of his patience, driving him to scream at the top of his voice and crash through the wall in Patrick's house to get out.

With no "idiot" present, Patrick's parents commend him on his newfound intelligence, and accidentally reveal themselves to be two random starfish named Janet and Marty. Patrick, confused and outraged, realizes that they are not his real parents, and demands to know who these strangers are. All of a sudden, Squidward comes to Patrick's house with two other starfish, who have been asking him for Patrick all day which has been driving Squidward nuts. Patrick happily recognizes the starfish couple as his real parents, and they are happy to see him as well, especially with his pants on. Janet and Marty then remember that they don't even have a son, and they leave Patrick to share a laugh with his real family, just as the rock slams shut on top of them while the episode ends.