My brother, mother and I were swimming in June or July 2005 and it was mid afternoon. I am always looking up to see airplanes and i saw a black triangle that was flying backwards and it was silent and yelled over to my mom who then looked up and saw it she did not know what it was either. There were no lights of any kind it was pure black i cant stress how dark it was. and it looked like it had a ball in the center on bottom(tried to do it on paint but i could not get it to look right). We watched it for 5-10 minutes before it went behind the hill. it was not very high in the sky but higher than normal airplanes. We live in an area that has (i would call)moderate amount of air traffic 5-10 low airplanes daily, but this was flying way off the normal path, normal being Northeast(to airport) and Southwest (from airport) and this was going north west over the lake and nothing ever goes that way. i have not seen it sense or anything close to it. i included a pic of the path. i would have drawn it but i have no scanner so i used paint do sorry about the quality.