The next time the siren song of Costco's half-sheet cake with the to-die-for (and drool-over) mousse filling calls out to you, remember: The wholesale club's bakery does not do special designs, and you might want to respect that boundary. Take it from a TikToker who recently ordered a cake from Costco for her son's second birthday party, requesting a Sesame Street-inspired design — and instead wound up with a blank cake to take home. #costco #fails #tiktok #viral #trends #trending #trend…
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