Commuters are a tough crowd. They come spilling off the trains, staring at their phones, sealed off from the world by their earbuds, and trudging resolutely ahead on their way to work.
But on a recent Friday morning at South Station, something silly happened. Seven people waved colorful, mostly handmade signs and shouted greetings: “Welcome to Boston!,” “It’s almost the weekend! Woo-hoo!,” “Happy Friday!” Even commuters had to smile. Some snapped photos with their phones to tweet or post on Facebook.