Selling a home is like taking an airline flight across the country. When you start on your trip, you have no idea how the trip will go. Neither does the pilot. You could run into 88 different types of turbulence, or other passengers on the trip could pull stunts on you. Ideally, you should have a smooth flight and land on time. Certainly the pilot will try to use his or her experience to navigate around the storms and go for the smoothest flight plan, but if they're honest, they can't promise a turbulent-free trip. Their job is to get you to your destination in the least time and with the least aggravation, while keeping you informed throughout the trip. Attached is a somewhat humorous list of the 88 different types of turbulence or stunts you might run into. This list is not all encompassing, but it catches most of the common issues.
Take a look at the pdf document to see them all: