While cleaning out a closet, someone stumbled upon a strange object hidden among old things. At first glance, it looked confusing — a small device tucked inside an envelope with unusual warning-style labeling.
Many people online were just as puzzled.
So what exactly is it?
It turns out the item is part of a classic novelty prank known as the “Rattlesnake Envelope” or “Rattlesnake Eggs” gag. These playful tricks became popular decades ago and were commonly sold in joke shops and novelty catalogs.
What Is the Rattlesnake Envelope Prank?
The prank works as a simple jump-scare gag.
Inside the envelope is a lightweight spring mechanism made of wire and a small frame. When someone opens the envelope, the tension releases instantly and the device pops outward.
The sudden movement surprises whoever opens it, creating the classic “it jumped at me!” reaction.
Why Is It Called “Rattlesnake Eggs”?
The name is part of the joke.
The packaging often looks like a fake warning label, sometimes saying things like:
“RATTLESNAKE EGGS”
“HANDLE WITH CARE”
“KEEP COOL TO PREVENT HATCHING”
Of course, rattlesnakes don’t actually lay eggs the way the label suggests — the absurd warning is meant to build curiosity before the prank delivers the surprise.
Other Names for the Same Trick
Over the years, this gag has appeared under several different names, including:
Snake in an Envelope
Jumping Snake
Pop-Out Envelope Gag
Rattlesnake Eggs
Despite the different names, they all work in the same way.
When Did It Become Popular?
This type of prank became widely known in the mid-20th century, especially when novelty joke items started being sold through:
mail-order catalogs, prank gift stores, toy shops.
Because many companies produced their own versions, it’s hard to identify a single inventor.
What Was It Used For?
People typically used the prank for harmless fun, such as:
sending a surprising letter to a friend, adding a shock moment to invitations, joking with coworkers or family.
The device can usually be folded back down and reused multiple times.
A Small Note About Pranks
Although the prank is meant to be harmless, the surprise can still startle people. That’s why it’s best used carefully and only with people who will enjoy the joke.
