A worker was seriously hurt after being shocked in the north suburbs on Tuesday, the fire department said.
A volunteer was walking the dog near PAWS Chicago's Lincoln Park adoption center when it appeared frantic and started yelping, then suffered a seizure.
The so-called "outlet challenge" involves partially plugging a phone charger into an outlet and then touching a penny to the exposed prongs, Massachusetts' fire marshal said.
Two electrical workers were injured while working on an electrical system in the Loop Tuesday morning, the Chicago Fire Department said.
Despite a full 20 minutes with no pulse, a team of doctors and nurses brought the man back to life using electric shock to bring his heart back into a normal rhythm.
A ComEd worker was seriously injured on the job on Thursday, according to Chicago Fire Department officials.