I was attending a campus event with about 500 people. It was outdoors at the University of Wisconsin- River Falls campus. Everyone was watching the comedian up on stage. After a particularily funny joke I look over to my friend to see if he was laughing, when an object in the sky caught my eye. It was perhaps 200-300 feet in the air traveling from east to west (towards Minneapolis). It was definatly three-dimensional, with a dark body and lines of neonish blue interspersed all down its underside. I can't acuratly describe the shape in words, but it didn't have wings or anything sticking out of it. It was longer than it was wide, and looked like it had geometrical shapes on it. It was traveling incredibly fast, and left a short tail in it's wake. It had no sound or smell. It traveled over a crowd of 500 people, and I saw many people look around in confusion after it had passed. However, I know that many people missed the "craft", afterwards I asked my friend if she had seen it, but she hadn't. I have no idea what this was, but it's the third time in the last year that I've seen something of this nature, although this was definatly the closest I've seen. All I'm looking for is answers.