Endless Baby Shark Birthday Card with Glitter

The song every parent fears, now in a birthday card they can't turn off

You know the one. The shark song. The melody that moves into a household and never pays rent. This card plays our own take on it — same infectious bite, with a Daddy Shark verse that's a little more aggressive than the version stuck in your head. The cover wishes a "Happy Birthday: Hope it's jawsome," and the moment they open it, the song kicks in on a loop and refuses to stop. The inside is blank.

For the kids, it's a delight — they'll want to play it again and again, which is exactly the problem. For the parents, it's a birthday card and a gentle act of revenge in one. The recipient will almost certainly text you "are you SERIOUS?!" — which might even start a conversation if you haven't talked in a while. Unlike a paper card that gets read once and forgotten, this one keeps singing for hours. For any birthday that could use a little harmless, catchy chaos.

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, the song 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

• For the kid who can't get enough — they'll be thrilled. The parents will know what you've done.
• For the parent who's heard it a thousand times — affectionate payback in card form.
• Shark-themed birthday parties — the favor that becomes the whole afternoon.
• From one parent to another — they'll laugh, then plot their revenge card right back.
• Office birthdays — a few minutes of this clears a room or unites it in shared suffering.