Silver metallic disc observed at Roseland little league baseball field.

On a clear summer day on the southside of Chicago, I was at Roseland little league baseball field with a group of other juveniles. Someone in our group said to look up. I looked up and saw a silver metallic disc in the southwest sky of our location. This object was zigzagging at such a fast rate. It was such an abnormal flight pattern. My first thought was that it was possibly a kite. So I looked down to see if anyone had a string below. After not seeing anyone below, I looked up again and continued to see this object zigzag. The best way I can think of describing what I saw is to compare it to someone holding a mirror or metal object, and then reflecting the sun off of it. The event lasted about 45 seconds. The metallic disc then just took off up and out of sight. There were no lights on it; no bulb; no haze; or any other crafts with it.
 I went home and expected to see something on the news about it. No such luck. Being that I was a juvenile at the time, I didn't really give it too much thought. I figured there had to be a rational explanation to what we had all seen. Then I figured, it couldn't be from outer space because UFO'S were always depicted to hover, have lights and land. Not be visible in Chicago of all places. This recent report of the sighting at O'Hare has compelled me to tell my story.