Static shocks are often noticed in cold dry weather, especially when in a centrally heated environment, and may disappear when the weather gets more humid.

To avoid shocks when getting out of the car, HOLD the metal door frame before you get out, KEEP HOLDING as you get out, until you are fully out of the car.
It's easy with practice!
If you have forgotten to hold the metal door part as you leave the seat, a shock may often still be avoided by touching the glass window before you touch the metal door. The glass may be conductive enough to dissipate charge, whilst preventing the rapid discharge which is felt as a shock.

Check this link
http://www.pei.org/static/static.avi

This astonishing video shows an accident in which a woman started a fire when refueling. She sat in the car as the fuelling was in progress. After getting out, she would have been charged with static - and caused a spark and fire when she reached for the fueling nozzle. She's lucky not to have been badly hurt.
That’s why the men working in the petrol station must wear a safety cotton coverall to avoid any static shocks.