In a scene in a Three Stooges film, a patient in a mental health hospital, pointing to a button-hole on his shirt, tells the Stooges, “I’ve seen rats come out of that hole!“ and everyone in the audience laughed. Well, the rats are coming out of the holes in the ground in the Boston parks where children play and out of the cracks in the Boston sewer masonry walls, but it is not funny. And their population is growing fast.