What's something people do in your country that other people wouldn't understand?

British. We are very serious about queuing and audibly gasp if someone jumps the queue. I'm not joking.
- Just got off the plane in New York. They are not good at queueing here lol. Wait to let people off the train!
  
  Oh the humanity!
- Finns as well. You could probably take a friend and form a 2 person queue on the sidewalk and after a while you'll have other people joining the queue too. Add free plastic buckets and the queue goes around the block.

Take something perfectly edible, like say an egg, and cover it in a coating made of mixed clay, wood ash, salt, and quicklime, rolling it in rice hulls and then letting it sit for weeks to months before, you know, eating it.
- Yes I've heard of this! How did that ever become a thing?
  
  There are a few stories about it, but the most plausible one is that an alkaline lake dried up and someone found an egg (or maybe a batch of eggs) in it and decided to eat it.

Drive trucks to the capital, honk horns, soak in hot tubs and wave American flags to protest their lack of "freedoms"
- Oh. I see we have a Canuckistani in our midst here.
  Yeah, the "freedom convoy" was one of those more bizarre things in recent Canadian history. (Funded by Americans, of course, because every right wing grift in Canada is funded by Americans.)

I've heard that drinking milk during meals is weird to some people.
- Is it common where you're from?
  
  In Finland, yeah. I believe Finns also have below average amount of lactose intolerance. Ability to drink milk is how our ancestors survived over the winter.