When the Nazis bang on your door in the middle of the night and ask, "Have you seen any filthy Jews in this neighborhood?" and you've got Jews hiding in your attic. When the bounty hunters tracking escaped slaves show you a wanted poster, ask if you've seen that "Negro" and that person is hiding in your barn.

When you are at a wedding and someone asks within earshot of the bride, "Isn't she beautiful?" and she doesn't quite measure up to your personal standards of beauty.