Oftentimes when someone has an umbrella when it is not raining, they are called a pessimist. I don't see why. First of all, maybe they are an optimist. They really want it to rain, so that the grass will be green, yet they just don't want to get all wet. Or maybe they are a realist. They checked the weather forecast and rain is expected. Or maybe they just always carry their umbrella because they know that it rains sometimes and they'd rather not get wet and maybe it's not that much trouble for them to just have the umbrella with them at all times, like if they keep it in their car or something.