The famous casts show victims of the volcano in Pompeii, including a family of four huddled together in their final moments, and a dog "fixed forever at the moment of its death as the volcano submerged the cities".

BBC: British Museum to exhibit artefacts from buried cities

This is the kind of information that is completely and forever lost, the moment an object is stolen.

BBC: Egypt revolution brings golden age for tomb raiders

Which meant that, when MoMA displayed it for the first time in 1939, it was able to promote it as something of a revelation that marked the moment the now-celebrated Picasso changed art forever.

BBC: Too famous to see?

Louis Rams played the Tennessee Titans in Super Bowl XXXIV, a moment that will be forever remembered as the dot-com bubble's Waterloo.

FORBES: The Bubble Bowl

But when we were stopped at a red light, that was the moment when I saw the homeless, hungry man who changed my life forever.

WHITEHOUSE: Following My Purpose

It was really only at the moment that I understood that he was gone forever.

BBC: NEWS | South Asia | Moscow's Afghan war: The mother's story

And in the meantime that moment when you received your medal will stay with you forever I guess?

BBC: News Online

Because trading has become so central to their business, the big banks are forever trying to invent new financial products that they can sell but that their competitors, at least for the moment, cannot.

NEWYORKER: What Good Is Wall Street?

Fifteen years after his death, Serge Gainsbourg remains legendary as the louche bard of sixties Europop, not to mention the inebriated Frenchman who once propositioned a teenaged Whitney Houston on live television (a moment now enshrined forever on YouTube).

NPR: Dirty and Bored: Serge Gainsbourg Revisited

"Every moment that I've had so far in and out of the pool will be with me forever, " he said.

CNN: Phelps wins historic eighth gold medal