Three Laws of Robotics

Asimov and all that. The Guardian writes:

"Computer scientist Bill Joy ..has urged the general public to start thinking about the dangers posed by the rapidly advancing science of robotics, and Greenpeace issued a special report last year urging people to debate this matter as vigorously as they have debated the issues raised by genetic engineering. "

However:

"Chris Melhuish, a leading British roboticist admits: "The biggest threat our robots currently pose to humans is that you can trip over them." "