There is never any telling what kind of message you’ll get in a birthday card — a couple of inside jokes, a heartfelt note, perhaps some surprise cash if you are especially blessed. But for one Redditor, the relaxation came with a twist: a hand-drawn grid reminiscent of a binary nibble birthday puzzle, filled with minuscule maze-like shapes that, at first glance, made no sense at all. No text. No instructions. So far, it’s nothing more than a cryptic pattern that’s been splayed out on a card.
At first, it looked like a sort or labyrinth or abstract sketch. But it soon emerged that it was no ordinary doodle. It was a binary nibble birthday puzzle — a tricky code with each little square containing a piece of a larger digital message.
Let’s break this down. In computer science, a nibble is a four-bit aggregation, or half an byte (or bit 0-3, and bit 4-7). And all those boxes on the card? That was a nibble. Two boxes side by side created a full byte — or one ASCII character. And here’s the really good bit: each nibble wasn’t written in decimal numbers but in lines instead.
Each box had lines leading out in as many as four directions — left, top, right and bottom. If there was a line in a direction, that bit was a 1. If not, it was a 0. So you read each box counterclockwise from the left, treating lines as a 4-bit value and absence of lines as zero.
Two adjacent boxes together lent you 8 bits — sufficient for a full ASCII character. String those characters together and just like that, the “random” pattern is a hidden message.
When someone on Reddit figured out the sequence, the first two boxes decoded to:
Strung together, that’s 01001000, or an H in ASCII. Next was a, p, p and y. It said “Happy” in a flash.
Full message unfolded itself as decoding went.
“happybirthdayloveyouguesswhatchickenbutt”
That’s right. After all the clever ciphering, the payoff was a classic childhood taunt — “Guess what! Chicken butt.” That’s the best combination of love and craziness. Nostalgic, cheeky, and strangely heartwarming.
In a digital age saturated with texts and quick little messages, this brand of analog creativity strikes differently. It combines:
It wasn’t just a birthday card — it was an experience. One that stopped the reader, made the reader scratch their head, decode some binary and then laugh at the end of it.
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