Pantos are humorous, slapstick entertainment for the whole family, often featuring men dressed in drag. They are sometimes based on a famous fairy tale or story, like "Cinderella," "Peter Pan," or "The Wizard of Oz." 

Pantomimes rely on specific tropes. For example, there's often a villain who will sneak up on the protagonist intermittently throughout the play. It's then the role of the audience to scream, "He's behind you!" to the main character while he or she struggles to figure out what's going on.

A traditional British roast dinner wouldn't be complete without Yorkshire puddings filled with Bisto or homemade gravy. Yorkshire puddings — not to be confused with sweet puddings — are made of eggs, flour, and milk or water.

After they're cooked in hot oil in the oven, they end up with a distinct hole in the middle. They closely resemble what Americans know as popovers.

While Yorkshire puddings are commonplace at Sunday dinners throughout the year, they're also eaten at Christmastime, though some argue they have no place on a Christmas plate.

While some do refer to old Saint Nick as Santa Claus in the UK, it is widely accepted that Father Christmas is his more traditionally British name.

"Santa Claus" is seen as an Americanism, and The Telegraph reported that even the British National Trust said that "Santa Claus should be known as 'Father Christmas' in stately homes and historic buildings because the name is more British."

In America, Christmas stockings are hung by the fireplace with care. However, some British children hang their stockings at the ends of their beds for Father Christmas to fill up while they're sleeping. 

Thanksgiving weekend is seen as an opportunity in the United States for students to reunite with friends from high school or middle school. In the UK, it's a tradition for school friends to come together on Christmas Eve, often at the local bar or pub.

A Christmas pudding is a dense fruit cake often made weeks or even months in advance. This time allows the dried fruit to soak up alcohol that's regularly poured onto the cake in the weeks before it's consumed.

On Christmas, the cake is set alight and then topped with a sauce of brandy butter or rum butter, cream, lemon cream, ice cream, custard, or sweetened béchamel. It is also sometimes sprinkled with caster or powdered sugar.

For many years, Queen Elizabeth II even gifted each member of her staff a Christmas pudding from Tesco.

While fruit cake is certainly a polarizing dessert wherever you are, Brits seem to make it a little better with thick, sweet white icing. Oftentimes, Christmas cake also comes topped with festive holly decorations. 

The BBC reported that the first-known mince-pie recipe dates back to an 1830s-era English cookbook. By the mid-17th century, people reportedly began associating the small pies with Christmas.

At the time, they were traditionally filled with pork or other kinds of meat, sage, and other spices. Nowadays, the pies are filled with dried fruits and sugar powder.

The perfect accompaniment to Christmas pudding and mince pies, brandy butter consists of butter and sugar beaten together before brandy is added. Rum butter is an alternative.

The result is still butter-like in consistency, and it's served cold alongside desserts. Americans might know it as "hard sauce."

You might remember a scene from the first "Harry Potter" movie in which Ron says, "Happy Christmas, Harry!" While this may sound strange to an American, saying "Happy Christmas" is commonplace in the UK, as opposed to "Merry Christmas." 

Christmas crackers are often pulled at the start of the meal, and the paper hats found inside are worn throughout the meal. Also inside each cracker is a "banger," which makes a loud pop when the cracker is pulled, a joke, and a small prize.

The jokes are usually cheesy and festive. For example: "Why did Santa's helper go to the doctor? Because he had low elf esteem!" 

However, be sure not to pack them if you're traveling to or from the UK on an airplane — they're not permitted to go through TSA in carry-on luggage.

On Christmas, the BBC usually runs a holiday special of the since-retired show "Top of the Pops," which features performances from the year's most popular musicians.

The program ran weekly from 1964 until 2006, when it was canceled. People were so upset that the BBC decided to keep the Christmas special, which airs late in the morning on December 25.

Every year, families gather to watch the royal Christmas address, informally known as the Queen's or King's speech.

The Telegraph reported that the first Christmas address was 251 words long, but Queen Elizabeth II later came to average 656 words in each speech. It is often one of the most-watched television programs on Christmas Day in the UK.

While Super Bowl commercials are highly scrutinized in the US, Brits pay just as close attention to Christmas commercials.

Not only is the John Lewis ad, or "advert," a Christmas tradition, but almost every supermarket and clothing brand tries to get in on the buzz with a talked-about Christmas commercial.

The British "Christmas No. 1" has been a tradition for over half a century. Starting in 1952, the top song on the British singles chart has been a coveted spot every Christmas. Christmas No. 1 alums include The Beatles, Queen, Ed Sheeran, and more.

While some Christmas No. 1s have indeed been Christmas songs — "Do They Know It's Christmas?" by Band Aid II in 1989, for example — they don't have to be.

While religious elementary schools in the United States may put on nativity plays, they are arguably much more popular and part of the culture in Britain.

In the popular British Christmas movie "Love Actually," the characters even attend a Christmas nativity play.

Boxing Day is typically called British Black Friday, but there are some differences between the holidays. Boxing Day, which is a public holiday in the UK, falls the day after Christmas and has a rich cultural history in Great Britain.

Originating in the mid-1600s, the day was traditionally a day off for servants. On this day, servants would receive a "Christmas Box," or gift, from their master. The servants would then return home on Boxing Day to give "Christmas Boxes" to their families.

Another difference between US and UK Christmas customs comes after all of the festivities have ended. 

In the UK, it's tradition to take down your tree and decorations 12 days after Christmas — known as Twelfth Night — to avoid bad luck in the new year.

In the Anglican tradition, Twelfth Night, or Epiphany Eve, is the day before Epiphany, which celebrates the coming of the Magi to baby Jesus and marks the end of the 12 days of Christmas.