thats called static electricity. it happens to me a lot too, and i dont wear a lot of metal.

static electricity is when your body picks up positive ions and when you touch something that's um..passive? or with negative ions, you create a charge.

it happens mostly in places with dry central airconditioning like the lower level at midvalley. carrefour especially.

do not drag your feet when you walk. most malaysians tend to. the proper way is lay your foot down heel-ball/soles of your feet-toe. this reduces the pick up of positive ions.

also, 9876789 is right. you can discharge by washing your hands.
or go outside and get some fresh air.

i find running my fingers through my hair also helps to discharge.