With Pokémon Go being the newest global phenomenon, it only seems fitting that I remind you to not use your phone while driving. In fact, Pokémon Go now requires you to press a button acknowledging that you're a passenger if you're going above about 15 MPH. It's there for a reason. Even if Mewtwo spawns out of nowhere and you're driving, it's definitely not worth injuring or killing someone. If you're on a Pokémon hunt, be sure to either get a designated driver or a passenger to ensure that your journey to be the very best doesn't ruin the rest of your life.
