Jay-Z has called for a boycott of Cristal champagne, after what he sees as racist comments made by Frédéric Rouzaud, managing director of the winery. Mr Rouzaud is quoted as say that the hip-hop association with Cristal was "unwelcome attention" and that "I'm sure Dom Pérignon or Krug would be delighted to have their business". For the juicy details, see the economist article where Frédéric Rouzaud was first quoted and Jay-Z's press release on the matter.