Imagine: it's early morning, you're fast asleep, and suddenly the sharp tap of a pea hits the window! This isn't a prank, but the work of a "wake-up caller"—a vital profession of the industrial era, ensuring the punctuality of thousands of workers. In 19th-century Britain, especially in factory towns like Manchester and Liverpool, many workers didn't have alarm clocks. "Wake-up callers" ensured they were awakened for their shifts, which sometimes began as early as 5 a.m., to prevent lateness. Their tools ranged from long sticks with wire to actual blowguns loaded with dried peas or sand. This method allowed them to wake people on the upper floors of apartment buildings without entering. For a nominal fee, usually a few pence a week, they methodically walked their neighborhood, knocking on every window. It was routine but responsible work, as being late to the factory meant hefty fines. The profession disappeared by the mid-20th century, when personal alarm clocks became affordable and accessible. However, the last "alarm clock makers" continued to work in isolated regions of northern England until the 1950s, before the profession disappeared entirely.