1. In the Netherlands, school finishes at midday on Wednesdays.
2. A widely believed urban legend in South Korea is "fan death," i.e., that sleeping in a closed room containing a running electric fan will kill you.
3. In Bhutan, wearing seatbelts in a car is considered dangerous.
4. In Slovakia, it's custom for boys to pour water over girls and whip them on Easter.
5. Nodding means "no" in Bulgaria.
6. In Norway, graduating high school students attend a russefeiring where they wear colored overalls, rent buses or vans, and party for 17 days straight.
7. Blood type is a huge deal in Japan.
8. A sizeable number of New Zealanders go out in public barefoot.
9. You have to pay for a license to watch TV in Britain.
10. Most people don't drink the tap water in Hong Kong.
11. You have to pay for every ketchup and mayonnaise packet at McDonald's in Italy.
12. Voting is mandatory in Brazil.
13. Many Icelanders believe in the existence of elves.
14. Canada sells milk in bags.
15. At a Dutch birthday party, you congratulate all of the guests, except the person who's having the birthday.
16. Swedes put kebab on their pizza.
17. In India, the car horn is as important as the gas pedal.
18. Switzerland has one of the highest gun ownership rates in the world.
19. In the U.S., over 1 million people flock to Times Square each year to stand in the freezing cold for eight hours just to watch a ball slowly descend.
"What is commonly known (or believed) in one country, which would be mind-blowing to foreigners?" originally appeared on Quora: The best answer to any question.