When you scuff your shoes upon a rug on a dry winter day, your body typically charges up to a potential of several thousand volts with respect to ground. In physics this is a well-known fact and is easily verified by meter measurements. Touch a grounded object, and a spark will leap between the object and your fingertip. This kind of electric spark can only exist when a high voltage is present. The tiniest spark requires about 500 volts. Big, nasty, painful sparks require lots more voltage, up to several thousand volts. But even when no sparks are jumping, there is still a high voltage between your charged body and the ground, and you body is surrounded with an invisible electric field.
Their measurements for different clothing and various car-seats give impressively high voltages, and this occurred at humidity levels above 50%. The voltages should be MUCH higher at, say 5% R.H.!
Nylon clothes: 21,000 volts (Yowch!)
Wool clothes: 9,000 volts
Cotton clothes: 7,000 volts
http://www.amasci.com/emotor/voltmeas.html