All teens lie, right? Teen lying is something that is done harmlessly and viciously. Teens lie for many reasons; most of them have to do with their ability to do it. Pulling a fast one over on mom and dad is something you probably tried too. But, in today's world, lying teens can get into a whole lot more trouble than you could. That is what makes it so important to know if your teen is lying to you and then to handle it.