When I was in Amsterdam I was with a group of acquaintances of a friend who lived there. One of them offered me an extra piece of pizza they had when I showed up. When the bill came, they asked me for the exact percentage of the bill that that piece of pizza cost. First time experiencing something like that.

I also offered to buy several people a drink while I was there. This was received every time with suspicion and I was treated as if I was trying to gain something transactional besides a simple friendship in the moment. It was an interesting part of that society to experience.