The Screamer – a yell-on yell-off light

Our next-door neighbor had one of the original Clappers and I distinctly remember the dad cursing whenever he would be channel surfing and accidentally turn to a show filmed before a live audience (like the Arsenio Hall Show) because the applause from the audience would occasionally trigger the clapper and turn the lights off in the living room.

https://en.wikipedia.org/wiki/The_Clapper

As a climber that word has a very different meaning to me.

A reminder that its better to live to climb another route than test the limits of what's possible.

https://www.needlesports.com/Catalogue/Climbing/Big-Wall-Aid...