They’re the ultimate late-night snack. Credit: Lydia ManselIt’s usually the simplest things that leave the biggest impressions. And there’s perhaps no greater example of that philosophy in action than the cheese fries at Paul’s Deli in Williamsburg, Virginia. Just ask any current or former William & Mary student.The appetizer is composed of just a few ingredients. French fries, a combination of melted mozzarella and cheddar cheese, and bacon, if…