Subaru Rust
If you are looking at buying a used Subaru Impreza, you should be aware that some of them rust very easily. This is probably more true for cars that are driven in the North East and North West. (I don't know how many people in the South West need to have all wheel drive.)
Take a look at the photo taken of the left rear tire. You can see some of the rust appearing between a couple of panels. The problem is that during a winter storm sand can build up between the panels and over time can cause rust.
Make sure that you look at the rear panels very carefully. If there is any signs of chip or rust, chances are that the rust and chip will get bigger.