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Pip is frightened when he sees the one-eyed man he met in the tavern years before. This was the man who stirred his drink with the file (from Joe's forge) and gave Pip a one pound note.
From the text:
"I entertain a conviction, based upon large experience, that if in the days of my prosperity I had gone to the North Pole, I should have met somebody there, wandering Esquimaux or civilized man, who would have told me that Pumblechook was my earliest patron and the founder of my fortunes."