The Christmas cracker is an integral part of British Christmas celebrations. It 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 produced by the effect of friction on a chemically impregnated card strip (similar to that used in a cap gun).