If you find yourself entertaining a group, or feel like eating an entire bag of chips alone for self-entertainment (hey, who doesn't every now and then), use this trick:
Lay the bag of chips on a flat surface. Cut (or gently bite) the bag of chips in the middle to make a small hole. From that small hole, cut or gently tear a circle in the bag, creating an open hole almost the size of the bag. Serve and enjoy, dispose of the bag when finished.