What was the unexpected inspiration behind Nike's famous 'Just Do It' slogan created in 1988?

Advertising slogans can define brands for generations. Nike's 'Just Do It' is arguably one of the most recognizable slogans in marketing history, having helped transform the company from a running shoe manufacturer to a global lifestyle brand. But do you know the surprising and somewhat dark inspiration behind this empowering slogan? Test your knowledge of this fascinating piece of advertising history!

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The last words of convicted murderer Gary Gilmore before his execution: 'Let's do it'
A line from the 1985 film 'Back to the Future' where Doc Brown says 'Just do it, Marty!'
Nike founder Phil Knight's response to employees hesitating on a new product launch
A modified quote from Theodore Roosevelt's 'The Strenuous Life' speech