Christmas crackers are small cardboard tubes wrapped in colorful paper with a twist at the ends. Inside, there's a small gift and a paper hat, along with a "bang" that creates a small popping sound when pulled. The tradition of making Christmas crackers is believed to have originated in England in the mid-19th century. The "bang" comes from a small strip of paper, known as a cracker snap, which is pulled when the cracker is pulled apart.