Something you don't see everyday

First of all, I apologize for the terrible quality of this shot.  I was on my way to work a week ago, and saw a "rainbow" around the sun.  I didn't have my camera with me but I did have my flip video.  However, the video I shot got corrupted somehow, and all that was left was about 2 seconds worth.  So I extracted this frame from the video.

What is it, you ask?  A halo around the sun.