Could my car be possessed?

The doorlocks go up and down by themselves. The radio turns on when itwants to and turns off sometimes when I want it on. Sometimes the headlights stay on when the car is off other times they stay on. It seems to have a mind of its own.

No. A vehicle can only be repossessed. You did not give the year of the s80 but I believe you have a problem with your Body Control Module. You may need a new one or just have the original reprogrammed. Find a good mechanic familiar with your Volvo. The BCM controls most if not all of the electrical components of the vehicle.