Worst Invention Ever

[MEbenhoe]

A question that came up today that I thought was worth some thought. Disregarding anything that would be worst due to the fact that it kills or physically harms people, what would you say is the worst invention for mankind, as in what would we be better off had it never been invented?

After thinking a little bit, I was able to come up with my own answer, but am curious to see what others say first, and if anyone comes up with the same answer.