sentences:  In Popper's, and the popular account, Wittgenstein used a fireplace poker to emphasize his points, gesturing with it as the argument grew more heated.When challenged by Wittgenstein to state an example of a moral rule, Popper (later) claimed to have replied "Not to threaten visiting lecturers with pokers", upon which (according to Popper) Wittgenstein threw down the poker and stormed out.