Of course Plagg would only mention his birthday the day before. Because, as the kwami himself had put it, "If I told you before you would try and make plans. And planning ahead is for suckers."
Real helpful, Plagg. Thanks. But Adrien knew he was probably lucky he had that much warning. He wouldn't put it past him to only tell Adrien the day of. So Adrien left Plagg at home and slipped out to go shopping. Even the little nuisance deserved a birthday present.
Adrien didn't need to think hard about the gift, though. A variety pack of fancy cheeses would delight the kwami, and it wasn't all that difficult to find. The card, on the other hand, stumped him for a while. For one thing, many of the birthday cards specified an age. Plagg was uncertain of his exact age, but he was at least three thousand years old. Funnily enough, they didn't stock cards for someone's 3001st birthday.
Of the remaining cards, most were sappy and heartfelt, the kind Adrien would love to receive. But Plagg just thought mushy stuff was gross. Some of the cards had jokes on them, which was closer to the kwami's style, but they didn't seem quite right.
After almost an hour of searching for the perfect card, Adrien finally found it. It was hilarious. It was glorious. It was perfect. Plagg would love it.
And so it was that when the kwami unwrapped his gift, he was greeted with both a heavenly smell and a card that said, "Age only matters if you're made of cheese. Happy Birthday!"
Plagg was not ashamed to admit that it was probably his favorite birthday ever.
