A common sight, made famous by the Terminator franchise, is the robotic apocalypse. It's usually said that due to their lack of organs and ability to use radiation and biological warfare without a negative effect on them, that we would be unable to offer resistance.
But obviously humans are strong willed and have their own benefits. We are immune to EMP and man-made computer viruses, which can be equally deadly. Assuming that all robots that currently exist (toasters, computers, smartcars, etc.) turned against us (and were as smart as the average person), could they really defeat us? How would they? Would we even have a chance? Would they?