Policemen and security guards wear hats with a peak that comes down low over their eyes. Apparently this is a psychological technique, because eyebro… - Banksy

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Policemen and security guards wear hats with a peak that comes down low over their eyes. Apparently this is a psychological technique, because eyebrows are very expressive, they let you down if you're lying or trying to bully somebody. You have far more authority if you keep them covered up. The advantage of this is that if makes it difficult for your average cop to see anything more than six foot off the ground. Which is why painting rooftops and bridges is so easy.