Snow in Phoenix Yesterday?

Yesterday night, it was snowing in Mesa near my house. Or at least I thought it was. I was driving out to hang with my friend Scott, and all of a sudden I noticed little white flecks catapulting on my windshield and beginning to cover the roadway. For a split second my brain went "HUH?!?" Then I saw the truck about a quarter mile in front of me, filled with pillows, a couple of which had split open, and small down feathers were flying out of the bed of the truck. The "snowstorm" was about the closest we'll come to winter weather in Phoenix, so it was pretty cool, even if it wasn't real!