It’s midday on a Tuesday, and people are scattered around the green lawn of Harborview Park, having lunch. Amid their quiet murmurs and the drone of traffic on nearby I-5, comes a thundering sound: laughter. About a dozen people stand in a rough circle near the park’s center, red in the face, doubled over laughing. Welcome to Harborview’s laughter club. For nearly two decades this is where doctors, patients, staff and members of the community have come together twice a month to laugh at nothing.