If someone was deliberately threatening me in some way, absolutely! Fortunately, the worst I have received thus far in my relatively short commuting career was a honk of the horn. However, the honk may or may not have been negative in nature (and may have been aimed at someone else whom I did not see). Although, when a few vehicles build up behind me, I'll generally pull onto the side of the road (where all the snow and ice is... which is why I am riding mostly in the center lane because it is the clearest) when safe to do so, and most of the drivers seem quite appreciative when I make way for them. Although, if it doesn't look very safe to climb onto that layer of ice and snow on the side lane, I'll hold my position (especially if the oncoming lane is clear for them to pass me in). Fortunately, nothing that has needed reporting as of yet. And I hope that there is no need to report anything in the future.