A webcomic called Nine Planets Without Intelligent Life had a clever take on this topic (years ago). Quoting http://www.bohemiandrive.com/comics/npwil/19.html

A webcomic called Nine Planets Without Intelligent Life had a clever take on this topic (years ago). Quoting http://www.bohemiandrive.com/comics/npwil/19.html http://www.bohemiandrive.com/comics/npwil/19.html (drag to read; the illustrations are highly entertaining): How and why do robots eat? The answer to the first part of this question is simple: Robots eat the same way humans eat. As to the why, it would be helpful to think of a saying of the late-human AI programming community. Building an artificial intelligence that appreciates Mozart is easy ... building AI that appreciates a theme restaurant is the real challenge. In other words, base desires are so key to human behavior that if they are not simulated ... convincing artificial intelligence is impossible.