The three most common reasons to go shopping on Christmas Day: (1) Although you remembered everyone else in your family, the very existence of your Aunt Lucy escaped your attention until your mom called this morning, reminding you that she still talks to imaginary people and that you should not laugh this year; (2) you are Jewish and have nothing better to do with yourself; (3) you are Muslim and have nothing better to do with yourself. Some stores account for possibility number 1 and stay open in the morning. But few account for possibilities 2 and 3, which is what makes Yummy's such a beacon. At Yummy's, non-Christmas-observing folks go right ahead and wish one another a merry Christmas. Why not? This is America, after all. And then customers walk away with armfuls of wonders: styrofoam squirrels, fake flower arrangements, discount dog food. We highly recommend the hot deli sandwiches. And if you're shopping for a December 26 breakfast, be prepared to be strong-armed into making hummus an important part of that meal. Such moments of cultural exchange should not be taken for granted.