I know…all rainbows are personal because they depend on refraction of light at the viewers position, but I thought this was cute and I felt like my rainbow had a real connection to me 
I was driving up the motorway into a heavy rain shower, so lots of rain and spray around. The sky behind was relatively clear though and the sun was shining from behind the car. I noticed a small rainbow, probably only about 2-3m in diameter, floating over the front wing of the car, only just out of reach (had I not been travelling at 40-50mph!). My rainbow stayed with me for about 1km until the road turned slightly. This might be quite common, but in my 40+ years of being in a car I don’t ever remember seeing it before.