Upside-down Rainbow

Last evening Hayden was outside swinging while I was in the mudroom working on the laundry. I heard Hayden frantically calling for me, so I ran outside and found him pointing up at the sky. The above picture shows what he saw..... an upside-down rainbow! I've never seen anything like it! Not only was it upside-down, it was also directly above our heads NOT on the horizon like most rainbows. I can honestly say it was one of the oddest things I've ever seen! Also one of the coolest!