When I first arrived at the United States, there were a few things that I could not get used to. These things, in fact, reveal cultural differences between the West and the East which might interest you.
First of all, Americans rarely drink hot water no matter how freezing the weather is. It was extremely cold in January and it snowed a lot then, so I always wanted to get some hot water to warm up myself. However, I felt really confused when I could not find any water dispenser with hot water during my first few days here because there is a water dispenser with hot, warm, and cold water almost every corner at schools in Taiwan. Therefore, I do not need to boil the water by myself. It was not until I saw my roommates drinking ice water that I realized it was a cultural difference in essence. Thankfully, there is a microwave oven at my dorm that I could use to heat the water.
Second, most restrooms in shops or restaurants are locked. In order to use them, customers have to buy things in the stores to get the password from the staff. Some stores print the password on the receipt, but others do not. For the latter ones, customers have to ask the password from the staff in person. I could not get used to this custom at first especially I was in a hurry to use the restroom. In contrast, most stores in Taiwan offer free use of their restrooms. It was really convenient on one hand, but on the other hand, it sometimes places pressure on the staff when they need to clean up the dirty restrooms. Therefore, I understand why American people adopt this custom, for it ensures the customers a high-quality environment and it also promotes consumption.