I live near Dallas / Ft Worth TX - where the headquarters for many oil drilling service companies are located.
I take a walk every evening for my health - one of the nicest areas to walk is a nearby subdivision with $1-2 million dollar McMansions. It is a stable, established neighborhood - I have rarely seen a house up for sale there in 9 years.
Now there are 8 for sale in the past month. All priced over a million US$.
Coincidence?