Plankton offers a chumstick to a hungry Debbie Rechid, who later considers going to the Krusty Krab for a Krabby Patty instead after discovering that chumsticks cost ten dollars. Plankton negotiates with her and Debbie stubbornly agrees to purchase his food. After taking a bite of the chumstick, she spits it out immediately upon its foul taste.
Nat Peterson becomes a frequent customer of Plankton's due to his love for them. However, near the end of the episode it is revealed that they actually made him sick and he only pretended to like the food so Plankton would stop complaining about his restaurant's poor business.
"The Krabby Kronicle"
Plankton bursts out of the kitchen, eagerly informing Karen of his plans to drive Mr. Krabs out of business with his chumstick. Health Inspector Yellowtail then enters his restaurant to assure him otherwise, due to an article in the Krabby Kronicle that suggests that the Chum Bucket promotes cannibalism.
"Chum Bucket Supreme"
Plankton feeds one to SpongeBob, which causes the disguise he and Mr. Krabs were hiding in to explode. SpongeBob is then seen wiping his tongue with a kitchen sponge, obviously disliking the taste.
Patrick orders two chumsticks from the eponymous place and slides the contents off using his teeth.
Chum is Fum
I can turn into a skyscraper!
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So far, Nat Peterson has eaten the most chumsticks out of everyone, although it did made him sick each time he ate one and caused him to get a stomach pumping several times.