Do you think, what you are thinking is interesting
1. What you are thinking is a tread name. I am either questioning what he is thinking or the thinking tread.
2. The way I worded it makes it sound like what he is thinking is boring him. But it can be reversed if it is talking about the thread. In that way everyone is thinking that their own thoughts are boring him.
3. It replaces the normal question mark with a backwards question mark. Which indicates irony but also acts as a question mark which is irony in its self.