Human brains are build for pattern matching. Suppose your brains often sees that A and B occur together. So when it detects A, it will expect that B will be there too.
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Have you ever gone to a grocery store the day before a big winter storm is supposed to hit? Did you see all those idiots shopping in a panic? Some are even picking up three loaves of bread and two gallons of milk! I mean come on! It's not like this is the end of the world! You live in a major metropolitan area: You don't need to stock up and go into survival mode.
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Several years ago, a friend updated his Facebook status with a link to a news article about how some group of Muslims was offended by being portrayed badly in media or something similar. My friend's comment on the story was very close to: "When they start worrying about offending us by crashing planes into buildings, then we can start worrying about offending them."
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