you guys drag your feet when you walk?
that builds up a static charge.. and if you wear rubber soled
shoes, the static charge does not get grounded...
so when something is not the same charge as you, and you almost
touch it, the charges in the form of electrons, "jump" across to
equal out the charge...
that's static 
probably where you were, the humidity is very low else humidity
also takes away a lot of the static charges
