Everyone smiles when there's a rainbow

Yesterday it was pouring rain most of the day, but right when I got off of work the clouds had parted and there was the largest, brightest, most colorful rainbow I've ever seen. A double rainbow. Everyone around me driving home from work had huge smiles on their faces, and people had come out of houses to point and grin. I think the effect it had on people was almost more fun than having a cool rainbow to look at. I was grinning ear to ear all the way home.