Are there signals that people should watch out for as warning signs when doing a used car search?

Are there signals that people should watch out for as warning signs when doing a used car search?
When doing a used car search, it is recommended to make sure that the vehicle comes with Repair Records, and isn't in terrible condition. A lack of Repair Records could indicate either that the vehicle is stolen or that there is something the seller wants to hide. A car being in terrible condition should speak for itself, as it is likely to fall apart.