This outlet was located behind a sofa at the home of one our customers. When an electrical device becomes old, worn out, or painted over they may be come dangerous. Do not let neglect be the cause of personal injury or property dammage. Have a licensed electrician check the devices in your home today. The terminations in your main panel can become loose over time due to vibration, corrosion, heat caused by occasional overloads, or improper installation. Loose connections can cause arching, arching creates heat, excessive heat will melt the casing of wires and the breakers they are connected to, possibly leading to a fire in your main panel that can spread throughout your home.