The Invention of the Christmas Cracker

Tom Smith, starting as a young baker, introduced the Bonbon to London in 1840. To boost sales, he added love notes, which led to the creation of the cracker, inspired by the crackle of a log. The cracker's snap was achieved through a chemical reaction. Initially called Cossacks, they were later named crackers. After Tom's death, his son Walter added festive jokes and paper crowns, enhancing the cracker's appeal.

Describe the mechanism that creates the noise when a cracker is pulled.

What changes did Walter, Tom Smith's youngest son, make to the mottos of the bonbons?