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When the lights dim in the prison, everybody knows that some poor sap's been executed.
Rolling Updates, Needs a Better Description, Needs Examples In a prison setting, sometimes there'll be a character on Death Row. The other prisoners by no means get to go watch the execution, but they'll know when the guy is dead when they see the lights dim. Once upon a time this was Truth in Television, as the requirements of an electric-chair were so massive that if you decided to go with an over-engineered single generator for the prison instead of a dedicated one for the chair, the lights would dim when you used the chair. Nowadays, though, this no longer happens, as they almost always have switched to dedicated units in the few states that still allow electrocution. Examples: Comics