Before she was an internationally reviled "pot princess" — long before she pulled out her cell phone, climbed into her car, and drove the wrong way down a highway exit ramp — Kayla Mendoza was just a typical 20-year-old South Florida girl. But then came the margaritas, the shots, and the infamous tweet: "2 drunk 2 care." In the fiery crash that followed a few hours later, Mendoza plowed head-on into another car and killed two women her own age. Mendoza says she doesn't remember the accident but is sickened by the deaths she drunkenly caused. She also says the tweet was in reference to an argument with her boyfriend, not a dismissal of the dangers of drunk driving. Despite her excuses, however, Mendoza faces a charge of DUI manslaughter. Her sad story is a reminder of the evil we are all capable of, if we let ourselves slip.