1. The police are not obligated to attempt to come to your aid. If someone mugs you and a cop is standing right there and decides not to intervene, that's your problem.
-Castle Rock v. Gonzalez (2005)
This means that if a mass murderer comes into my classroom and starts shooting at me and my classmates are legally on our own (it already being established that the College of William & Mary has declared campus a Second Amendment -free zone). Then again, maybe I'm paranoid. It's not like anyone would ever shoot up a law school or a public university in Virginia, and certainly not this decade.
2. No matter how well-kept your property is, if your neighbors have let their places fall apart, the state can take your property under eminent domain by claiming "community redevelopment."
-Kelo v. City of New London (2004)
Especially while at Virginia Tech, I did a fair amount of volunteering with a group of Evangelical missionaries up in Chester, PA. One of the main things they did was operate a mission school for those in the Chester-Upland School District (last-ranked in all of Pennsylvania) that basically said "Pay what you can; we'll find a way to cover the rest." They had two buildings: Douglass, where the elementary school (and when I first started volunteering, a small middle school program) were operating, and Carver, across the street, where they were hoping to eventually start a middle and high school. In the wake of Kelo, the city decided that a better use for Carver would be a parking lot for the horse-racing track they were hoping to build. They eventually used it to build low-income housing after taking it from the missionaries.