Many thanks whyteknight foryour reply. regarding the first point, I was shocked by an english guy here on the forum calling a Pakistani guy by "Paki" (Sorry) which is enough to take him to jailhere in Englnad.

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You have probably come across "mad" people in the street incessantly talking or muttering to themselves. Well, that's not much different from what you and all other "normal" people do, except that you don't do it out loud.