Tipping is part of American society, and most people do it without thinking. It's customary to tip 15-20% if the service is good.
American portions are huge. Restaurant meals can contain three times the required amount of food.
American drinks usually have ice. We rarely think how unusual this behavior is in other countries. Ice cubes in drinks are strange in many nations.
The Fahrenheit temperature scale is popular in the US. Outside America, the Celsius scale is preferred. Both scales accurately measure temperature using different methods.
Flags are everywhere in the US due to Americans' infatuation with them. Every home and practically every business proudly displays the American flag.
Patriotism inspires nationalism. American patriotism involves celebrating Independence Day and Memorial Day, hanging the flag outside homes and businesses, and buying American-made items.
American culture has embraced drive-through culture. Americans drive through fast-food establishments and banks.
Baseball and American football are America's most popular sports. Both are longstanding and firmly ingrained in American culture.
In the US, products and services are usually sold without sales tax. However, this method may seem weird to other countries that incorporate taxes in prices.
Halloween is celebrated worldwide, including in the US. Costumes and pumpkin carving are popular Halloween activities for Americans.