These are all observations made in Oklahoma, and might not apply to all of the U.S. Also, some of the stuff might just be weird to me since I'm Norwegian and might not be weird to other foreigners.
1. Ice in drinks. Sometimes there is more ice than drink.
2. You have to tip the waiter. It's not a thing you do if actually liked the service you got.
4. The gaps! I will never understand why anyone thought it was a good idea to put gaps between the door and the walls on public toilets. Let me pee in peace!
6. Being "born out of wedlock" is still a thing. To my now husband's distant relatives, I was known as the foreigner who gave birth to his child out of wedlock.
8. The price tag is not the actual price.
10. Before getting into the country, they actually ask you if you are a terrorist.
12. Your cucumbers are weird btw.
14. Some people wear shoes inside.
16. You can't drink tap water. At least not where I live.
18. Some people (like my husband) consider donuts as a legit breakfast!
20. They will also give you random compliments, even strangers. In Norway, people will definitely think you're crazy if you talk to a stranger.
22. You can turn right on red! I had never even heard of that until I got to the U.S.
24. Snow days. Everyone freaks out when there is even 1 mm of snow and raid the grocery stores so they don't have to leave their houses. In Norway, we go to school in thigh high snow, because otherwise there wouldn't be school half of the year.