At the end of the meal George handed out a large stockpile of Weasley's Wizard Wheezes Christmas Wackers to share, Hermione pulled one with Ginny and a tiny Mariachi band popped out on the table and started to serenade them both, when they finished they poofed back into non existence. Harry pulled one with Ron that when it broke a huge hammer came out and hit Ron on the head which made the whole table fall about the laughter. On the next try when the cracker popped it covered Harry in a huge shower of slime. 