Have you come across people who are not what they seem to be like someone who is extremely friendly and helpful yet you are not very comfortable with him/her as you feel it is a put-on? Have a class discussion about such people and why you feel as you do.
Student 1: I know many people who are not what they seem. They use you to get their work done in a very clever way.
Student 2: Yes, I also agree with that. My mother is right in saying that excess of everything is bad. So, if we come across a person who is being too friendly with us, we must smell a rat and be careful.
Student 3: One of my friends is very helpful sometimes but I never find him too comfortable to be with and sooner or later his real motives are revealed when he asks for a bigger favour in return.
Note: Students may extend the discussion on their own.