We can behave in a ethical by understanding the situations around us. Suppose I am in a party. And suddenly the waiter arrives and serves the foods. And even though nobody has touched the food I just take the dish and try to start after the waiter  has just served it. If I do so, some people will assume that I am manner-less. I have never seen this much food on the table before. So, we need to understand the situations around us and act accordingly. I  believe the first thing of ethical behaviour is that we should be great observers and act as the situation demands us to.