We have all seen those commercials of children who break or mess up something that will undoubtedly make their parents mad. The children are always portrayed as innocent angels who just couldn't help but grab that last cookie from the cookie jar. My favorite advertisement is an old one where a toddler has chocolate smeared all over his face and is confidently, without an ounce of self doubt, lying to his mother about not having eaten the chocolate cake. We learn quickly. At very young, impressionable ages we realize the power of manipulating the truth.
Some children learn faster than others.
The bottom line is we all learn to do this. I am not advocating lying. I hate it when people lie to me. I try my best to avoid being dishonest with others. There are no rules to this game.