Human's Hands~

Well, i got nothin to say much here but i'm here to share something,
its kinda lame but i heard this quote in a drama movie.
it says, human's hand is a gift of god, but yet.. it is a very special one.
"When the others is greeting u politely with their right hand, the might hiding a evil punch at their left hand.."

:) Do everything and treat everyone real and 100%??
Not really...