It’s National Peanut Butter Lovers Day. Set down your afternoon snack for a second and consider your preference for one of the most nostalgic foods you’re still in love with: the PB&J. Even with this, the world’s simplest sandwich, there are rules. They’re strict and vary with individual tastes, but these rules are undeniable and unbreakable when constructing a sandwich. Plain bread or toast? Strawberry jelly or grape? Do you use one knife for the peanut butter and another one for the jelly, or the same knife for both? Is it ok to lick the knife? Do you spread topping on each slice then smoosh together, or dribble the jelly on top of the peanut butter? And most importantly, do you prefer creamy peanut butter or chunky?