In the Bluey episode titled 'Christmas Swim', the family of pooches gather around a table for a festive lunch wearing tissue paper crowns.
"Apparently, the rest of the world doesn't do paper crowns at Christmas," an Aussie wrote on Reddit.
It's tradition across Australia and the UK for guests to pull part bonbons, also known as Christmas crackers, to reveal a colourful tissue paper crown, a joke or riddle and sometimes a little toy.
The crowns are then worn by guests during a Chrissie meal.
An Aussie expat explained in the comments of the Reddit post, "It's a British Commonwealth thing. They are in some of the Harry Potter Christmas scenes, for example."
"Yeah, I just asked a Canadian, and he assured me they have crackers and paper hats and knew what was talking about," another replied.
A Brit explained that they shared this tradition in England, "but as far as I'm aware, we exclusively call them crackers. Bonbons are a type of lolly.”
"This made for some interesting stares when I worked on the help desk of a shopping centre in Cairns and kept directing people to the lolly shop when they asked for bonbons."
In 2023, a mum from the US took to the 'Adult Bluey Fans' Facebook group to ask what the paper crowns were about.
"Can any of our lovely Australian members tell me why they're all wearing the crowns in season two, episode 26 'Christmas Swim'? I thought it was so cute and would love to know more about it!" she wrote.
"It's tradition in Australia. Bad jokes, paper crowns, salads, seafood, cricket, Christmas is awesome," one Aussie replied.
"Christmas lunch is one of the most quintessentially Australian traditions," another said, adding, "The food is usually the most eclectic mix of hot turkey/chook, roast potatoes, ham, salad, prawns, seafood and BBQ followed by pavlova and Christmas pudding."
Some Aussies were shocked to discover that this wasn't an international tradition during the festive season.
"My mind is blown, I thought Christmas hats/crackers were universal. It is basically Grinch behaviour to not wear a hat at Christmas lunch in our family. We need to send you some!' another said.