A surprise is something that happens unexpectedly and catches you off guard. It can be pleasant, like a party, or unpleasant, like sudden bad news.
From Old French 'surprise' meaning 'unexpected attack or capture', from 'surprendre' (to overtake, to seize). It originally had a more aggressive meaning before softening into the idea of any unexpected event.
Your brain is a prediction machine, and a surprise is what happens when reality breaks your prediction. That shock is so powerful that we build entire parties, stories, and jokes around the joy of being wrong for a moment.
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