Christmas crackers or bon-bons are an integral part of Christmas celebrations in the United Kingdom, the United States, and Commonwealth countries such as Australia, Canada, New Zealand and South Africa. They are also popular in Ireland. A cracker consists of a cardboard tube wrapped in a brightly decorated twist of paper, making it resemble an oversized sweet-wrapper. The cracker is pulled by two people, and, much in the manner of a wishbone, the cracker splits unevenly. The split is accompanied by a small bang or snapping sound produced by the effect of friction on a chemically impregnated card strip (similar to that used in a cap gun). One chemical used for the friction strip is silver fulminate, which is highly unstable.

Crackers are typically pulled at the Christmas dinner table or at parties. In one version of the cracker tradition, the person with the larger portion of cracker empties the contents from the tube and keeps them. In another each person will have their own cracker and will keep its contents regardless of whose end they were in. Typically these contents are a coloured paper hat or crown; a small toy, small plastic model or other trinket and a motto, a joke, a riddle or piece of trivia on a small strip of paper.