The purpose of the game is to associate convincer cards with a topic card. But you have to explain to the other players your thinking and they have to approve.
For example if your topic is "Movies" you can say "Friday 13th" and play a lake, a knife and a mask. In this case the film is about “Jason” that kills people camping near a lake. He has a mask on his face and use a knife when he kills. This should not be so hard to explain and have the other players to approve.
This is a very fun party game that can be played in many different ways.