Poltergeists may be a good guess.
Voltage is electrical potential between two points. Normally a house has three wires supplying power, black, red and white. Between the black and white wire, voltage is about 110 v. Between the red and white wire it is also about 110 v. Between the red and black wires it is about 220 v. Half the 110v circuits in your house are powered off the black wire and half from the red wire.
If you have a bad connection on the white wire and there is a return path for a circuit on the black wire side back through the red wire side, you can get upwards of 220v in a 110v circuit. This happens when circuits share a common box that are powered from both the red and black wires.
Confused yet? Check the voltage in the socket and see if it is 110v. Also look for signs of arcing on the center terminal where the bulb screws in..