Negative download transfer rates

Wow! My transfer rate when downloading the .NET Framework 3.5 beta 2 reached -940314704 KB/sec! Was the download was so slow that it turned into an upload?



Wait a minute, all of a sudden my download got superfast. More precisely, 1044392007 KB/sec. It's likely my download transformed into some sort of upload, not only because the previous transfer rate was negative, but also because the blue progress bar proceeded backwards. That is, after a while I had less content downloaded... Go figure.