Who said this phrase during a concert: Does Anybody Remember Laughter?

In the 1976 Led Zeppelin's concert movie "The Song Remains the Same", recorded over three gigs at Madison Square Garden, when the lead vocalist Robert Plant sang "Starway to Heaven", after the line “and the forests will echo with laughter….” Plant exuberantly engages in a bit of unrehearsed crowd work, crying, “Does anybody remember laughter??”

For anyone who’s seen the movie, the phrase can function as an automatic killer laugh line when the conversation hits an unexpected lull or needs that extra bit of non-sequitur levity—it communicates that you know your rock and roll history but also that you can deflate a bit of rock and roll grandiosity. Even when the listener doesn’t get the exact reference, somehow Robert Plant or someone like him is evoked, in all of his 1970s bombasity and idealism and excess.

Apparently Plant himself cringes every time he hears it.