Grocery stores are like IKEA: you have to assemble the food yourself.
Grocery Store Assembly
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Explanation
Explain Bear
Listen up, buttercup. You go to IKEA, right? You buy stuff that you gotta put together yourself. This joke says grocery stores are the same because you buy, say, flour, eggs, and sugar, and you gotta assemble that stuff to make a cake! I bet you buy your cakes from the store, don't you?