Past Lives

Why is it that whenever people say they’ve had a “past life”, they’re always saying they were fearless warriors, Cleopatra, nobility, Florence Nightengale, Abraham Lincoln, or some other cherished historical figure? Why is it that no one ever says, “I was Sidney Plotnick from Flatbush” or “I used to be that guy who lived in a box under the Brooklyn Bridge that one really cold winter with all the snow”? Or just “I was Cindy”?