Dave's Birthday is a fan fiction written by Manta-bee and it centers on Alvin wanting to plan Dave's birthday party, while Simon is skeptical they could do it all by themselves, his thoughts begin to change as they actually pull it off.


It is Dave's birthday and Alvin and Theodore want to plan a party. Simon says that it's no use and that it won't work, but Alvin thinks otherwise. After making the gelatin mix, buying a card and signing it, and making a banner that says "Happy Birthday Dave" written in crayon and marker out of paper towels, Simon begins to think it may work after all, which it does, when Dave seems very happy when he comes in and sees it all.

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