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First old man: "My memory is so bad, I have no idea what I did yesterday."
Second old man: "Well, my memory is so bad, I have no idea what I did this morning."
Third old man: "Well, I am glad that I don't have any memory problems. Knock on wood..." (Third man raps soundly against the arm of his chair, then immediately looks around and stands up.) "Excuse me while I see who's at the door."
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