1) Go to Whiterun.
2) Run a rampage killing everyone
3) ?????
4) Lolololololoolol
Remember in Oblivion, where if you killed somebody, then everyone would start running away from you? Or in Morrowind, where everyone and their mother would grab a pitchfork and chase you?
Skyrim, everyone just yells "By the gods!" and then continues on about their day. No running, no attacking you.
Just "By the Gods! .....I work for Belethor, at the General goods store. *chops wood*"