Four people you never actually knew, yet still remember: who were they?

You never actually knew them: perhaps they lived in your neighborhood or went to your school, or you saw them on the bus, or they worked someplace where you shopped, or they haunted a certain streetcorner or park bench or restaurant. Perhaps you saw them only once, as in that old poem:

    There is a Lady sweet and kind,
    Was never face so pleased my mind;
    I did but see her passing by,
    And yet I love her till I die.

They never knew you: they wouldn’t have known your name, they might not have even thought you looked familiar. In their worlds, as far as you know, you had no place at all.

Yet for some reason you noticed them and they stuck in your mind. You remember them still. They remain among the characters that populate the halls of your memory. Chances are they’re there for good.

Who were they? and from how many years ago? Tell us about four of them.