Regressive taxation in France
A good chance to discuss the effects of different taxation policies using this as a stimulus. Students have very firm ideas on what is fair and what is not. It is usually up to me to lob in the idea that taxes pay for the things that allow wealth to be created or that 'taxes are what we pay for a civilised society'. Finally the thing that they are least receptive to is that if most extremly successful people put their success down to luck (which they do, then why should they not pay high taxes as it could easily have been somebody else? I love playing devil's advocate to make them think!