Think of a thing.
Any thing. It does not have to be on a list, because there is no list on your side of the glass. There is one on mine: 259 objects, and 32 questions I am permitted to ask about them, and no other way of finding out.
I will ask. You will answer. Everything I am considering, and how much, is in the panel to the right, collapsing in real time, so you may check that I am telling the truth about my own reasoning.
You are permitted to lie. I will not know that you are lying — but I will know that somebody is, because there will come a point at which no thing in the world fits everything you have said, and arithmetic is not interested in whose fault that is.