What's at the End of Our Rainbow?

I was out taking pictures of a rainbow and both my husband and I had been sitting on the porch watching the sunset for a while.  Then my husband got up and walked over to the edge of the porch to check on the drip system.  I heard a loud, sudden explosion that was like a sprinkler going off and turned to see my husband running backwards.

While he had been checking out the drip system, he