Where were you when the lights went out?
Today is the 16th anniversary of the blackout that hit Ontario back in 2003.
The widespread power outage started in the late afternoon that August 14th day throughout Ontario and parts of the U-S - affecting about 55 million people.
It took a week or two for power to be fully restored to everyone.
In Toronto, they are celebrating with a 16th Annual Blackout Anniversary Party at Nathan Phillips Square.