What if I absolutely can't resist nose-poking? Ever?
Just be ready for an explosion of rage, then. Of course, it depends on the context. If you do this when you're joking around, he'll just get annoyed/offended. If you do this during an argument, RUN LIKE HELL.
"How dreadful!" cried Lord Henry. "I can stand brute force, but brute reason is quite unbearable. There is something unfair about its use. It is hitting below the intellect." ~ Oscar Wilde - The picture of Dorian Gray