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What went wrong here? Bob (approaching a crowd): What happened? Tom (with Bob): What's wrong? Bystander: Just a little mix-up. A car wanted to drive on the sidewalk, that's all. There was a terrible noise, an explosion that shook the house. Bob looked at Jane and said, "What happened?"
See also: what
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.