Things Only Adults Notice in “SpongeBob SquarePants”

Being Insertive

So a joke where SpongeBob gets sat on is already going somewhere dirty. In an effort to get him free, Plankton tells SpongeBob to “Be assertive!” SpongeBob misunderstands, and sticks his finger into the fish’s pocket. SpongeBob is being “insertive,” and adults everywhere get a joke that flies over kids’ heads.