I've never encountered pumpkin juice in any context other than Harry Potter. I'm not sure why @HeirGaunt thinks it's a real thing?

 

It is referenced as a real thing on the first page of this thread.

 

I have seen stores sell pumpkin juice around halloween in Germany, my Grandmother who is diabetic also drinks it occasionally.

It's not particularly bad, but I never enjoyed it.

 

I thought using broom closets to do... You know what was a Harry Potter thing. I was proved wrong when I happened upon a very noisy broom closet. At work. And I knew who it was. Awkward.

 

I mean, pumpkin juice even exists in India, but it's definitely not something you can find being sold on street corners. There's some people who fetishize all things pumpkin because it's easily digestible or something who have it in the deep recesses of their homes. It's somewhat common among diabetics as well. But it's not a regular drink. Like, you don't get offered pumpkin juice anywhere you go, you have tea/coffee like regular human beings. When it was mentioned that it's something had semi-regularly in polite company in Britain I genuinely went wtf.

 

Treacle tart?

I learned this sometime in elementary school... from a D&D rule book.

This.
I probably saw them in stores, years before I knew they were British or that they contained hats and bad jokes. Still haven't bought any, but I've fired off plenty of those little champagne bottles full of streamers over the years.

A substitute name for Sundaes that is so ridiculously fey it should be a hopeless understudy on Broadway.

If you can fit two or more people in it, someone will engage in some sort of sexual hi-jinks in it. Doesn't matter if it's as small as a closet, as big as a movie theater, or as awkward as a mid-80s turbo-charged hatchback that your girlfriend thinks she just stalled because, just as you managed to get your head under the steering wheel, you accidentally put the gear shift in neutral with your chest.

You know what, just never mind that last one. Forgeticus! Obliviate!

 

Calling adults by their title+last name
Here children call adults, including teachers and friends' parents, by their first name. I haven't called a single person by their title+last name in my life, so I thought that was a Harry Potter only thing when I was younger.

(Edit:Though, now that I think about it, that might be an age thing instead of a country thing? I know my country did the whole title+last name thing decades ago, but it had gone out of style by the 90s, so it might be both?‍)

 

Nah, in the UK folk like teachers generally get addressed as Mr/Mrs/Ms, or as Sir or Miss. Whether that applies to friends parents or not is more down to your own parents and what level of formality they choose to impose.

 

It's pretty common where I grew up (Midwest USA). Kids call teachers and most non-relative adults are called Mr./Ms./Mrs. LastName, most people call college professors Professor LastName, etc. There are some college professors who had us call them by their first name, but that was partially a preference thing, partially because we were all adults, and partially because it was a community college instead of something like MIT.

 

For some reason I never used 'Professor' + last name in college (university). If you had a doctorate, everyone called you 'Doctor' + last name.

 

That's true outside the States as well. It's one reason why, even as a kid, I was kind of unable to digest all teachers at Hogwarts being professors.

 

Cough! Lockhart Cough!

 

I hate to break it to you, but that's not how professorships are awarded.

 

Pumpkin juice. My grandma was very against Harry Potter because of "witchcraft" so on my eleventh birthday, when she made pumpkin juice and gave me a glass, I was very moved , thinking she got over her hate and tried to do something nice for me, because I loved the books. When I said so, she told me she drank it because of health benefits, along with a lot of other people. I was floored.
However, I am sad to say pumpkin juice, at least made by grandma, tastes awful.