I had one the other day where I was fourth and last in line waiting at a red light. A biker passed me on the right, but instead of passing all the cars he instead waited in front of me. Once the light changed he started riding in the middle of the road. So apparently this guy had something against me and wanted to slow me down. I can think of no other reason why he would do that. I had passed him a couple minutes earlier and I gave him a ton of space when I did that, completely crossing into the other side of the road (yeah I know , chef, that's where I went wrong).