I was in the audience of the Phil Donahue show many years ago, and got to shake his hand.
I met the 1960 World chess champion Mikhail Tal at a tournament back when I played competitive chess. He signed one of my scoresheets of a game I won
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But the best story wasn't me, it was my sister-in-law. In the 1970's she worked at a department store in Carmel, California. One day, then-mayor Clint Eastwood came in and asked her where the towels were. All she could say was "..Hi...". She said he laughed, and was a very nice man (what happened?).