This possibility of a once in a generation moment passed us by and we will regret it.

CNN: Was Rio+20 a failure of political leadership?

Four years ago, it became a once in a lifetime moment.

CNN: How Obama made opportunity real in America

Speaking to the Independent newspaper, Richard Reeves - who stood down as the Lib Dems' director of strategy on Thursday to work in America - said Tuesday's vote was a "critical moment" for Lords reform and "a once-in-a-generation chance" to secure it.

BBC: UK Politics

You might say that it marked a peculiar moment in the evolution of Gawker, which was once described to Denton at a dinner party as the place where losers talk about winners a venue for punching upward, with hive-mind tendencies of its own.

NEWYORKER: Search and Destroy

Today, after a difficult decade that began with war and ended in recession, our nations have arrived at a pivotal moment once more.

WHITEHOUSE: President Obama Addresses the British Parliament

From the very moment I found out I had this once-in-a-lifetime opportunity, I committed to taking full advantage of it, giving it my all.

CNN: The key to fitness? Schedule it in

And so we come to a moment of deja vu, in which we see gamers once again labeled with that most perennial of put-downs: Entitled.

FORBES: Upset 'DmC' Fans Are Entitled Because That's What We Call People Who Complain About Video Games

And once again, it was to prove a rare moment of goalmouth action as most of the play was conducted in a congested midfield.

BBC: Wigan 1-0 Tottenham

"Once again, you've honored me with your confidence, and once again, I am committed to earning it, " Daley said in a brief victory speech that also included a moment of silence for the victims of dual nightclub disasters last week.

CNN: Chicago Mayor Daley wins fifth term