Any number of problems that Popper cited were rejected, and
finally, when Popper turned to problems of moral justification,
Wittgenstein asked for an example of a moral rule. Since Wittgenstein
had happened to pick up a poker from the fireplace and was waving it
around while making his points (was this, as analytic philosophers
like to say, "hand waving"?), the example Popper offered was, "Not to
threaten visiting lecturers with pokers!" Wittgenstein then threw
down the poker and stormed out of the room, slamming the door (the
rumor quickly spread that they had even come to blows).
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Unlike Popper, who did physically assault one of his students.
[in WW Bartley "Unfathomed Knowledge Infinite Wealth, Open Court P.]
Ian