I tried touching my keys before I get out today. It did not work, I still got the buzz I always do. I also tried touching metal stuff inside that car, but that doesn't work either.
If I try to close the door by bumping it shut my thigh or elbow (depending on which I use) gets buzzed. It seems like I will get shocked if any part of my body touches the car door.
By the way, I live in CA, so it's not that cold, but it is winter, so maybe it'll happen less in the summer.