Remember when grocery store aisles sparkled with wild Jell-O flavors that made you do a double-take? Some of these jiggly treats were so weird they disappeared faster than dessert at a birthday party.

Jell-O has been a staple in American kitchens for over a century, known for its wiggly texture and vibrant colors. Over the years, the brand has released a wide variety of flavors—some wildly ...