Peter Munz

“Towards the end of October 1946, I had the good fortune to be present at a confrontation in Cambridge which marked a water-shed in the history of modern philosophy. The Cambridge University Moral Sciences Club had invited Karl Popper to speak.
[…]
After Popper's declaration that he did not believe in puzzle-solving and his affirmation that there were genuine philosophical problems, Wittgenstein started to challenge him to name a 'philosophical' problem. I cannot now recall the precise sequence of events, but after Popper tried to name one or two philosophical problems and Wittgenstein kept countering by saying that he did not know what he would 'mean' by his statements, the drama occurred. Popper was sitting on one side of the fireplace, and Wittgenstein on the other. Both were facing the audience. In the middle, in a big armchair, there was Bertrand Russell. Suddenly Wittgenstein, who had been playing and fidgeting with the poker in the fire, took the red-hot poker out of the fire and gesticulated with it angrily in front of Popper's face. Thereupon, Russell – who had so far not spoken a word – took the pipe out of his mouth and said very firmly in his high-pitched, somewhat scratchy voice: 'Wittgenstein, put down that poker at once!' Wittgenstein complied and soon after got up and walked out, slamming the door.
Looking back now after nearly forty years, one can see the real significance of that incident. It prefigured the clash of philosophical opinions which has developed ever since the gradual decline of Positivism has turned into a rout.”
― Peter Munz, Our knowledge of the growth of knowledge: Popper or Wittgenstein?