No doubt the way people eat in your country seems quite normal to you. But there may be elements of it that would strike people from other cultures as quite peculiar.
Here are a few interesting dining customs from around the world:
In China you are expected to leave a small amount of food uneaten on your plate. If you finish everything, you are sending the insulting message that not enough food was served to you.
You should not spear food with chopsticks, nor separate them, nor gesture with them, nor clink them against each other.
In Crete people rarely eat the last meal of the day until 9 PM or later. Restaurants will be largely empty during what is considered the dinner rush in America.
It is not the norm for each person to order for themselves individually in a restaurant. Generally food is ordered for the entire table, and it gets passed around for everyone to share.
In Egypt, a loud belch after a meal is a way of expressing your satisfaction and complimenting the cook.
In Japan it is acceptable to loudly slurp noodles and similar foods. In fact, it is considered flattering to do so, because it indicates that you are enjoying the food.
There is no custom of tipping in restaurants (or elsewhere) in Japan.
The Japanese pufferfish, or fugu, is a delicacy in Japan. It’s also potentially one of the most poisonous foods in the world, with no known antidote. Japanese chefs train for years to remove the deadly portion of the fish before serving it, though generally the goal is not to fully remove it, but to leave just enough of a trace to generate a tingling sensation in the mouth, so the customer knows how close he came to the edge.
In Kenya and other places in Africa, there are still people who practice the warrior tradition of drinking cow’s blood, either directly from the cow, or after mixing it with milk as a delicacy.
In Mexico it is considered rude to leave the table until a respectable amount of time has passed after a meal. To get up to make a phone call, use the bathroom, step outside for some air, etc. should be avoided right after a meal.
It is customary in a restaurant for the host to ascertain everyone’s choice ahead of time, and then to order for everyone.
You are expected to keep your hands above the table at all times.
In Sweden, going “Dutch” is the norm. Even on a date, it is customary for each person to pay their share of the bill. Generally in fact this is calculated precisely; it is not enough to estimate it roughly.
* United States
In America, people go to restaurants with arches and goofy clowns, speak their order into a speaker from their car, pick up their food at a window of the restaurant while still in their car, and eat strange, tasteless foodlike substances that make them hopelessly obese while playing Monopoly games they are less likely to win than to be struck on the head by an asteroid.