No Christmas is complete without some terrible cracker jokes: we round up 50 of the best (make that worst). Apologies in advance. Who wants to live in a world when Christmas doesn't accompany some of the worst jokes the world has ever seen? It's as traditional as buying. Hey M&S, this cracker joke works with "E.T." because it's short for something. You can't just stick "elf" in there. PM - 26 Dec.