Firstly, begin by finding a subject with only a "Yes" or "No" answer.
Then by gently probing your opponent with sly, yet subtle questions not immediately focussed on the "Fight" subject, you determine their views about the subject.
Once this has been established, you take the contrarian side, and then with logic and phoney statistics, you should easily create a situation where a good argument begins.
I use this to determine the intelligence (intellect) of my opponent. Not that everyone should be viewed as an "opponent", but in order to build trust in any relationship, I find that a good understanding of someone's capabilities is essential.