One of the things you do just before Christmas dinner is to pull a cracker!Christmas crackers are just a fun thing to do. You get to put on a hat, get some cringe worthy jokes and get a prize.
How good the prizes are in the crackers depends on how much you spend.
What is a good idea is to buy the Christmas crackers in the sale and save them for the next year. Put them away with your Christmas tree. That way you can get some decent crackers but for good price. Or even shop around just before, as some reduce them early.
But yes the best thing about the cracker is the rubbish jokes and the laughing at how cringey it is.