Right, I was correcting myself, not you. I had written "darkest night". What I meant was I didn't know it was "blackest night" because I'm more of a Marvel fan than DC.
He's a character from the Green Lantern comics, I forget his name. But they're basically the space police or something (if I remember correctly) and their motto is:
In brightest day
In blackest night
No evil shall escape my sight
