Here are some one liners...
Terra Nova, Terra America -- The first global map is printed with Columbus's discoveries included but the new regions are not labelled as Columbia. They are labelled America. I also talk about how people decide what things are named such as ISIS, vs ISIL, vs IS vs what have you.
The Aztecs and the End of the World -- The Aztecs have a ceremony that is supposed to stave off the end of the world. It doesn't work because Cortez is coming and I talk about Y2K and the panic over that. As an option, the Jonestown massacre was along those same scarey lines.
Living OVER a Bridge and the Gas Tax -- The Pont Notre Dame bridge is completed with 60 brick houses on top of the bridge. I talk about the poor maintenance of the bridge, the 2007 collapse of the Minnesota bridge and the proposed raising of the gas tax.