As you walk out you turn back to see her smiling at you from the counter, then something shimmers, like a thin sheet of water is covering the entrance. One moment it's the old diner with the smiling woman, next its a crumbling building. It's full of ivy and blackberries creeping in from broken windows. Gone are the florescent lights, instead the ruin is visible by a hole in the roof. This sky light reveals the most disturbing part, a slumped skeleton over the counter, wearing the same floral print button down and apron as the woman. 

Another shimmer covers the entrance and the diner is back to normal, and her smiling face greets you again...