I had two Harleys pass me on the right. It was weird, but I was doing well over the limit, so I didn't feel I had to hang on the right of the road. I knew the road got a bit more twisty, so I did what I could to hang with them until it did, then once I caught them, I was in their mirrors the whole time.
Two of us were descending into Ojai valley and we caught up to a pick up truck and we were about to pass him and he wasn't going to let us. He was squealing the tires and almost lost it so we backed off. He had a woman and a child in the car with him.