I just recently bought a house in Markarth, and found it pretty damn amazing. It has a MOUNTED SKEEVER HEAD! Anyways, after walking down, I find a guard standing in the middle of a bridge. No one was nearby, and it was very tempting.
One 'FusroDAH!' later, the guard's body has fallen into the trade area. A dozen people gather around it, freaking out. A guard comes up, and says there is nothing to see, trying to contain the panic. He asks me if I've seen anything. Of course, I find this to be a great oppurtunity to refuse to answer questions and insult the guard. "What are you going to do? Arrest me?" "Very well. You are under arrest; Come quietly." I was shocked and mind-blown at how corrupt the guards are, outside of quests. Of course, I resisted arrest and ended up with a dozen guard heads to add to my collection, but still. This city is the best.