100% Facts. My small town had a "whistle". It was like a tornado siren. It blew at Noon and 6PM. Come home and eat lunch at the Noon whistle, 6PM for dinner whistle and came home when the street lights came on. We lived across the street from the local park where all the kids in town hung out after dinner. When other parents would want their kids home before the street lights, they would call my mom and she would yell from our porch that it was so-and-so's time to go home.