Pls explain the static charges/ current felt thru' finger tips from top of some of chair's back?

Question

This happens when a person is away only and when one casually touches the back top after some time

Answer 1

This is called 'static electricity'. It happens more in the winter. It accumulates and discharges in all types of objects. You can generate(accumulate) it by shuffling your feet across the carpet and discharge it by touching something more grounded than you (like a doorknob or another person). Staic electricity can screw up your computer bad if it isn't grounded or if the house wiring isn't 100% correct. Heres a more scientific explanation...
http://www.enchantedlearning.com/physics/Staticelectricity.shtml