what happened if you dont mind me asking?

I'm not really sure, but I think some kids Sidewalk chalk either got pulled up into the wheel well and got caught between brake and the rim, or someone put some in the wheel well when I was parked at work. I was very luck, it actually didn't leave a single mark on the calipar. I got it off with a 3M product and a little elbow grease. I was so happy too, cause I only had about 2,000 miles on the car.