The worst I've had was a couple of years ago in Peterborough at a large, multi lane roundabout with traffic lights. We were at a set of lights and I was in the middle lane in the 350z with a small white panel van to my right. I realised I was in the wrong lane and needed to be in the right one, lights go amber and I pull off quite quickly, but smoothly..no big clutch dump, indicate right and pull over to the right hand lane and stop at the next set of lights well ahead of the van.
He then pulls up next to me on the left lane and I became aware of some commotion. I look over and he is going absolutely apoplectic at me, he is gesticulating, shouting bouncing up and down in his seat, the works! I just grin widely and give him a wave and carry on with my day when the lights go green.
The really odd thing though, was that he took the next slip road - so he needed to be in the left hand lane anyway!
Some people need to relax more when driving
He then pulls up next to me on the left lane and I became aware of some commotion. I look over and he is going absolutely apoplectic at me, he is gesticulating, shouting bouncing up and down in his seat, the works! I just grin widely and give him a wave and carry on with my day when the lights go green.
The really odd thing though, was that he took the next slip road - so he needed to be in the left hand lane anyway!
Some people need to relax more when driving

In this case I was quite near my home and there was just light Sunday traffic on the road. No more traffic lights ahead, so I did get to my location marginally quicker. Oh and the acceleration was good fun anyway, it's not all about shaving off 20 seconds from my journey.