This Fall I am teaching two Intro Macro classes. This would be the students' first Econ class, so I am covering basic Micro Principles as well. Last week we talked at length about Unintended Consequences and I think my students get the idea. Here is a piece from the WSJ that gives some more examples. I must say, I never thought about smoking rules and obesity as having some correlation. My classes will be reading Freakonomics next week and we will also see the movie in late October and have a discussion on it.