An ESI whom I like but consider to be a bit selfish: " Do you think I am selfish?"
Me: "well if you are selfish and I tell you that you are, you wouldn't take my word as fact and will hate me for thinking you are and if I say no you aren't it would boost your ego.
If you aren't selfish and I tell you that you are, not only is that unfair but also shows my inability to make judgements and would also make you dislike me as a result of which will not take me seriously. If I tell you no you are not and you really are not, since you are asking this question now, you will think I'm lying. So I don't really know how to answer that question."
ESI: "So you think that I'm selfish!"
Me: "How do you define selfishness?"
ESI: "You think too much"
Slightly offending (just slightly, mind you) ESIs who are already friends with you makes them like you more, usually.