Science fiction writer Isaac Asimov famously devised three laws that all robots should follow:
1: A robot may not injure a human being or, through inaction, allow a human being to come to harm.
2: A robot must obey the orders given to it by human beings, except where such orders would conflict with the First Law.
3: A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.
Simon Primordial Greeble created LEGO dioramas representing these laws. The second is illustrated above.
So: there's a dog poop piece. That never appeared in any set that I owned as a kid.
Link -via Geek Dad