In the winding streets of an old city, you discover a shop you've never noticed before—The Memory Exchange. Inside, you find shelves lined with glowing glass jars, each containing a memory for sale. The proprietor explains that people often come to sell their painful memories and purchase happier ones, but there's a catch: every transaction changes something fundamental about who you are. Write about your visit to this shop, the memory you consider trading, and the unexpected consequences that follow.