I couldn't quite spot my favourite passage while speed re-reading Sanjaya Baru's The Accidental Prime Minister: The Making And Unmaking of Manmohan Singh, but roughly remember it being about the former PM, while he was still a high-level bureaucrat.

He had a friend visiting him in office. On his way out, the friend asked if Dr Singh's car could drop him to a certain point. Could it rather not, Dr Singh gently whispered, since he had an "official" car, which could be used for no other purpose!