Being one who LOVES rainbow I went out to look anyway, just in case. (And smartly grabbed my camera!) I stood by the loquat tree as directed and scanned the sky. At first I didn't see it as I was "just" looking over roof lines and tree lines. When he said "look straight up" he really meant straight up! When I finally looked straight up this is what I saw - an upside rainbow!
No, I have not altered the photos, this is the "rainbow" as I saw it..I didn't have any landmarks (like trees or buildings) so I had my son stand in the frame to get a little perspective. The battery on my camera was dying so I only got the 4 shots. By the time my son ran in the house, grabbed his camera and got back outside it was gone.
I searched the Internet for "upside down rainbow" and found that technically it is called a "circumzenithal arc". It happens by sunlight refracting through a thin layer of ice crystals high in the atmosphere. You can click the link to read more about the "smile in the sky!
Have a fabulous week!