This episode of Scotcast contains some strong language.

If you’re interested in this episode, you may also like ‘Irvine Welsh: Mobile phones destroy culture’ https://www.bbc.co.uk/sounds/play/m002gqtv

In 1989, John Davidson (pictured 2025) was on TV screens as a sad and lonely teenager in the documentary John's Not Mad.

Today, he tells us what it’s like to have his life and journey with Tourette’s syndrome turned into a feature film, I Swear - and of his pride in the next generation, including Billie Eilish and Lewis Capaldi.

Scotcast is the BBC’s Scottish news podcast, with Martin Geissler, Laura Miller and Natalie Higgins.

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Photo credit: Eoin Carey. Additional material provided by STUDIOCANAL