"The Invention of Lying" is a 2009 comedy film directed by Ricky Gervais and Matthew Robinson. The story is set in a world where everyone tells the truth, and lying does not exist. The main character, Mark Bellison, played by Ricky Gervais, discovers the ability to lie, which leads to unexpected consequences and social changes. As Mark begins to use his newfound skill, he manipulates situations to his advantage, gaining wealth and influence. The film explores themes of honesty, morality, and the impact of deception on relationships, ultimately questioning the nature of truth in society.