One maintenance worker had what we'd call a 'bad day at the office' when he caused a power cut that grounded flights and left 6 million people in the dark in California and San Diego, suggest reports.
The power outage grounded flights, caused huge traffic jams, and left people trapped in lifts and on theme park rides.
It was San Diego that was hit the hardest, with the city trolley system that helps thousands of commuters get to work shut down, and rush hour traffic coming to a standstill.
According to the Daily Mail, APS, Arizona's largest electricity provider, said a worker doing maintenance near Yuma triggered the blackout.
The error occurred on a high-voltage line linking Arizona and San Diego, and the fault caused a series of grid failures that went all the way to California.
An APS statement explained: 'The outage appears to be related to a procedure an APS employee was carrying out in the North Gila substation.
'Operating and protection protocols typically would have isolated the resulting outage to the Yuma area. The reason that did not occur in this case will be the focal point of the investigation into the event, which already is underway.'
The company was also quick to confirm that this was an accident, and not sabotage.
One expert said that the searing heat could also have affected the transmission lines.
Some people were left sweltering in temperatures of up to 115C, while others were left stuck on rides at Sea World in San Diego and Legoland in Carlsbad.
Power was on its way back to being restored on Friday morning to the six million people that were left in darkness.