What is that act of eebadah, that when you are doing it, no one else in the world can do it until you have finished!
Its kissing the Hajar Aswad!
Note that we kiss the Stone because the Prophet did so,and not because it has any special powers.
The silver casing is not the Black Stone!
There are 8 pieces left of the original stone from Jannah,and they are arranged inside the silver casing.
Yes I kissed it. How? That is a story for another day!