Quicksilver was a television quiz show produced and broadcast in Ireland by RTÉ and hosted by Bunny Carr from 1965 to 1981.

Competitors were selected from the audience by drawing numbered tickets, prompting many amusing exchanges as they competed for small monetary prizes by answering a series of trivia questions.

During the game, the contestant had two opportunities to call "Stop the lights!”, passing on the question and preventing the potential prize from decreasing further.

The challenge could take many forms, such as singing a verse from a favourite song, or answering all of the questions they had been asked during the game so far.

The first contestant of the show, if any, to have the lights stopped exactly on the secret number won a bonus "super prize" regardless of the outcome of the game.