CLEAN : Familiy arrives at court for Pistorius sentencing

The video tutorial discusses the context and utility of a handy device, questioning its necessity on Earth. It opens with introductory remarks, followed by a discussion on the device's usefulness, and concludes with a question about its need on Earth.

What does the question 'Earth, would you need it?' imply about the relationship between Earth and the subject?

Who might 'Darcy' refer to in a conversation, and what could be the context?