A good example of somebody who approaches the level of worst enemy would be something akin to Robert Schiro, who already has his license suspended, hit a cyclist with his BMW, leaving her crippled for life, then drove off and tried to hide the evidence. And then, while he was waiting for sentencing, got caught again for reckless driving. He also, by the way, complained that he doesn't live near any grocery stores as an attempt to justify why he should be allowed to continue to drive after all these driving incidents...