Haha, the funniest thing I have ever seen so far. An imperial courier came up to me while I was talking to the gaurd outside of Riften, (He was telling me that I need to pay the visitor's tax) well, the guard all of a sudden stopped talking to me and yelled "Down with the Empire" and completly slaughtered the courier.
I felt sort of bad...But it was hilarious. It just sort of made me mad that I didn't get the letter, and it wasn't on his corpse either.