Rattle Snake EggsJ101
This classic prank is always fun to play on friends and family!
This envelope advertises itself as a sachet of '1 Dozen Rattle Snake Eggs' and warns 'Store in Icebox to prevent hatching'.
When your victim goes to have a peek inside and see what's actually inside the sachet it will suddenly vibrate in their hands and make a loud noise, scaring the heck out of them! XD
There's not really Rattle Snake Eggs inside, just a clever wind up device which will spin, bashing the sachet around and making noise when someone opens the envelope.
The device can be reset, allowing you to use the trick over and over. Harmless, but fun!