Does Chocolate Go Bad?

This Would Never Happen To A Woman!

So, in the process of excavating my office, I run across a 4 oz bar of Cadbury Royal Dark chocolate that got squirreled away in the back of a drawer, and is of indeterminate age.

It's at least pre-LOLA (Sept. 09), and may go back a year before that. I really don't even remember buying the thing.

Still, it's dark chocolate...