Amusement. Sometimes when I'm in a public place such as a bank, convenience store, or whatever I find myself bored and begin wondering, "could I pull off a robbery here?" I'll start noting things like positions of the exits, cameras, how alert the employees are, whether any of the customers could give me trouble, etc.
Then I switch it around and think, "If somebody in line with me suddenly pulled a gun and announced he was robbing the place, how would I react? Can I reach any particular person immediately? Can I get my knife out in time to surprise him? Can I take cover behind that display over there and sneak out the exit?"
I'm sure that somebody, somewhere, has started a similar train of thought and decided, "Ah, what the heck. Let's find out! NOBODY MOVE! THIS IS A ROBBERY!"
Some crimes, such as the most infamous bank shootout in history, seemed to be perpetrated solely because the bad guys WANTED to get caught and gunned down.