What most naturally follows?

How to create shaving cream rain clouds
Fill a clear, glass container of the way with cool water.
You can use a cup, bowl, vase, or jar, but make sure that it is clear. This will allow you to see the rainstorm later on.
Avoid using anything with a narrow opening, however, or you will have a hard time adding the shaving cream. This is a great project for teaching kids about rain.