To add to the ways to prevent this from happening, if you're like me and tend to build up some kind of charge when in vehicles, if you hold the metal frame of the door while you're exiting, you won't automatically shock yourself the next time you touch metal. Don't ask me why. There's probably some great scientific explanation for it, but all I can say is that it saves me innumerable shocks in the winter months.
I actually prefer it dry to humid, so I'll deal with having to work around the shocks.
