Have you ever noticed how that one little word could take on so many meanings?
For instance, if someone says something to agitate you to the point he/she think you're going to react, a quick hands on the hips and a firm "And" assures the person you're not moved by what was said.
Or if someone wants to make sure you do want they want, "And I think you should..." is where "And" becomes demanding.
How about "And" as the shocker. "And you did what?"
So many jobs for such a little word, but it seems to be carrying its own weight.