Mumbai, Jan 3 (IANS) Director Rajkumar Hirani is flabbergasted by author Chetan Bhagat's allegation that '3 Idiots' was majorly copied from his bestseller 'Five Point Someone' without giving him due credit. Terming it a 'clear case of defamation', Hirani says they may take legal action against Bhagat for flouting their contract.