SpongeBob SquarePants - Season 6 Episode 22 -

Chum Bucket Supreme: None of Plankton's intellectually advanced advertising slogans for the Chum Bucket seem to be working. Plankton decides to switch gears by hiring someone who can create the dumbest slogans ever-Patrick! Single Cell Anniversary: It's Karen and Plankton's wedding anniversary, and Karen has gotten Plankton the best anniversary gift ever-the Krabby Patty formula! But she refuses to give it to him until Plankton gives her the best gift ever, too. If only he knew what that was!