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It's also a nice way or a mean way to let someone know that you cared in some way that they're here. Whether you continue to feel that way depends on how the person you greeted responds to the greeting. Nice or mean depends on how you point your finger and which finger you used or how you used it (E.G. by showing, pointing, pulling the pin on a grenade, the trigger of a gun, or pushing into their eye etc...) or if any fingers are involved.