Rushed
Here is something you can look for if you want to be able to see when someone is trying to trick you. If you feel like you are being rushed into making a decision with someone, then that probably means they are trying to fool you into doing something you do not want to do or buy for example.
Make sure that you always have enough time to think about any decision and do not let other people rush you into anything. This means that they just want you to accept their terms before you think about it for too long because they know that what they are offering is not the best thing out there.