Some people choose to put different types of food on their sandwiches that you wouldnt normally put on a hot sandwich.
For example if you were going to make a hot sandwich, it would have things like grilled chicken, fish, cooked and hot items.
Answer: you should use the topic: a scene featuring 2 characters sitting on the edge of a bridge
because: you could choose to make it a happy scene or a depressing scene or you can add two of the choices together and have two people together on a bridge and one is proposing to the other which may give you extra credit (depends on the teacher)
A fighting game such as Tekken because your goal is to beat the other person no matter what. Hope this helps.