Endless Birthday Card with Glitter

The original endless birthday card — and it does not quit

The cover says "Happy Birthday to You!" The inside says "Forever." And it means it. This is the card that looks like a beautifully designed birthday greeting right up until the moment they open it — and a loud, cheerful "Happy Birthday" song starts playing on a loop and won't stop.

We've made this card for over a decade. It's the one that started it all, now with an updated look but the same relentless cheer underneath. The recipient will almost certainly text you "what did you DO?!" — which might even start a conversation if you haven't talked in a while. Unlike a paper card that gets read once and recycled, this one keeps singing for hours. For any birthday, any age, anyone who deserves to have their day celebrated whether they like it or not.

How the Endless Musical Card Works 

1. Open the card to test the sound, sign it, then close the card to stop the sample.
2. Insert the card into the envelope and pull the tab from the spine to arm it.
3. Once they open the card, it loops non-stop — even if they close it — and plays for hours, until the battery dies.
4. If they try to break the card to stop the sound, a hidden glitter trap is waiting inside.

*Plain white envelope included in all cards

Ideas for When to Use It

• Family birthday parties — the card that becomes the running joke at every birthday after.
• Office birthdays — cheerful enough to seem nice, relentless enough to take over the whole floor.
• Milestone birthdays — 30th, 40th, 50th, the ones that deserve a little extra commitment.
• From the kids — "we picked it out ourselves," which is exactly the problem.
• Last-minute or long-distance — mail it like any normal card; the surprise travels just fine.