Double Rainbow

I’m not sure about the science of it, but every time we see a rainbow here in Skittles Valley, it rains bits of colorful candy.
Everybody runs around with buckets, catching the candy.
When all of our silos are full, the candy company comes around and buys up our annual harvest.
However, every now and then, there’s a double rainbow.
Nobody’s standing around with a camera shouting “WHAT DOES IT MEAN?”
Instead, we run to our cellars and wait for the storm to pass.
Glass breaks.
Wood splinters.
The winds howl.
What does it mean?
Insurance rates are going up.