There are some absolute wankers in rexes, on a recent trip to sydney I had a full kebab-spec rex blast up behind me, change lanes at the last second and roar around me on the inside at about 180km/h. After me he proceded to do the same thing to an AMG SL merc who was cruising along up ahead.
Boy, did he ever show us... (I was hoping the SL would really show him what-for, but alas, he didn't)