The Collingridge Dilemma:
A new technology's impact cannot be fully predicted until it is fully developed and used, and by then it's too late to do a damn thing about it.
Asimov's Three Laws of Robotics:
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 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.
A direct correlation exists between the decibel level of a public cellphone call and the pointlessness of the caller's life.