Some people have awnings on their homes. These are often made of fabric, sometimes of metal or maybe wood. We only have awnings in the winter. They're made of ice.
When it gets just warm enough, the sheet of ice/snow on the low-slope roof will start to slide off. Ever. So. Slowly. The sheets of ice will be sticking out one to two feet before they finally break off.
One half falls harmlessly to the ground. The other half falls onto the roof below (with a mighty crash), slides down that roof, then onto the sidewalk and plants below (thereby utterly destroying a couple of the cages around our blueberries.) We'll have to do something about that next year.