One day in the Pickles' household, Grandpa Lou is cheerfully enjoying television when he realizes he's out of his favorite snack, Fudgy Ding-A-Ling Bars. While Lou looks for another box in the kitchen, Tommy sees a commercial for brand-new Reptar Cereal, which promises to turn milk green. Tommy becomes determined to have Reptar Cereal as he's picked up and carried into the kitchen. It turns out there aren't any boxes of Fudgy Ding-A-Ling Bars left in the entire house. Grandpa Lou announces he's going to go to the store to buy some more, and is given a list of groceries for the entire week by Didi and Stu. Lou insists he just wants his snacks, while Didi and Stu point out he ought to buy the week's groceries while he's there. Stu also loans Grandpa Lou his scientific calculator so he can calculate sales and coupons before checking out. Lou insists he doesn't need a calculator for a few snacks and claims he can use his fingers just fine; he can even use his toes for larger numbers. Lou is reminded, again, that he's buying all of the groceries and is urged to take the calculator. Grandpa Lou takes the list, the calculator, and Tommy with him and leaves the house without saying much else. Didi hopes he comes home with more then just armfuls of Fudgy Ding-A-Ling Bars. Stu just hopes he comes back. At the grocery store, Grandpa Lou actually abides by Didi and Stu's wishes by picking up (most) of the groceries while Tommy keeps an eye out for Reptar Cereal. Grandpa Lou makes a point of avoiding picking up the cereal on the list (Corrugated Bran Puffs) and sarcastically comments on them before finally grabbing more then a few boxes of Fudgy Ding-A-Ling Bars. Now that he's finished shopping, Grandpa Lou tries to use the calculator to figure out the total cost of the groceries, though without much success. While his grandpa's preoccupied, Tommy decides to look for Reptar Cereal on his own. Using a link of sausage as a lasso, he latches onto another cart, which takes him away from Grandpa Lou. As he travels along, Tommy passes another cart with a baby girl in it. Tommy tries to ask her where Reptar is, but the cart pulling his along takes him away from the girl before she can answer. Shortly afterwards, Tommy decides to abandon his cart in the middle of the store so he can search on foot. Tommy encounters the girl again and asks a second time if she knows where Reptar is. It turns out the Reptar Cereal is right on the end of that aisle. However, before Tommy can move, the girl's mother sees Tommy under her cart and panics. She backs into a display of watermelons, which topple loose and roll throughout the store, knocking over and breaking many things. Tommy is knocking down Wipe Offs, Nonsense Baby Powder, Baby Oil, Baby Shampoo, Baby Lotion, Super Dry, Squeaky Clean, Tighties and Snug Fits on the floor. Meanwhile, the watermelons chase Nonsense Baby Powder, Perpi soda, and lobsters on the floor. Customers all over the store panic and announcements for aisle cleanups go out over the intercom (Grandpa Lou is oblivious to all of this as he's still fiddling with the calculator). Tommy and the baby girl find the entire thing amusing. Tommy sets off toward the display, where he hitches a ride on a miniature working windmill (an advertisement for the store's Dutch Bakery) and winds up on top of the light fixtures. Tommy climbs down a large Reptar cutout to the top of the Reptar Cereal display. He grabs one of the boxes and rides it like a sled down the display (knocking it down in the process) and back towards Grandpa Lou. Grandpa Lou finishes using the calculator and notices Tommy on the floor with the box of cereal. Unaware of the entire incident, Grandpa Lou puts Tommy back in their cart (which ended up back next to Lou during the chaos) and heads over to the checkout. As Grandpa Lou unloads the cart, he comments on the state of the store and notices the box of Reptar Cereal. He isn't sure how it ended up in their cart, but doesn't care, as it sounds considerably more appetizing then Corrugated Bran Puffs. As Tommy and Grandpa Lou leave the store, calls for cleanup continue to go out over the intercom. Steve and Larry, who currently work at the grocery store, argue over who's going to clean up the next mess. Both of them insist they don't have to do it based on the messes they've already cleaned up, while the voice over the intercom yells for one them to clean up the mess.

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