Everyone knows this phrase, has heard it, and probably used it. Basically, it means that nothing ever comes in small doses. If one thing is gonna go wrong, 10 things are going to go wrong. It's just the way it is, and recently this has proven to be incredibly true in my life. However, it is not necessarily proving true in the traditional meaning of the phrase.
Rain can be damaging as well. Too much rain can cause flooding, death, destruction of homes and landscapes. There are also many other dangerous thing that are associated with heavy rain, lightning, tornadoes, high winds, are all usually accompanied by rain. There are a lot of people who don't like the rain, especially lots of it. It makes everything damp and dark.