How to make a rainbow

We bought a new 'watering gadget' this week. We set it up this morning and let the water flow. I stepped back into the garage and noticed that the angle of the sun and water flow at times produced a brief rainbow effect. I immediately grabbed the camera, stood at the rear end of the car, and took multiple (20-25) shots hoping to get one I could use. This is it. A bit disappointed that there wasn't a pot of gold at the end. The geraniums will have to do.