Fun origin story for the phrase โthat came out of left fieldโ
Before relocating to Wrigley Field the Chicago Cubs played on the near west side of the city, on what is now part of the University of Illinois at Chicago campus. The field was adjacent to a psychiatric hospital. Specifically the left field side backed up to the place. On warm days, the patients would occasionally yell stuff out the opened windows during games so the sounds came from left field. And an idiom was born.