Thought I'd share mine here! Only a little one but what the hell - first proper one in my first 6mths of riding. Pretty simple really. I was riding in the middle of the day in Indooroopilly in Brisbane approaching a large multilane round about (those who are familiar with the area will know it - the large one with the Audi (formally Ford) car yard in the middle of it). Approaching the roundabout, I was in the left lane, a white Triton was in the right. We both stop at the round about to give way, and when the coast is clear we both accelerate out into the roundabout. I'm a bit quicker off the mark so the middle of my bike is inline with the front of his ute when all of a sudden he changes lanes - no indicator, no warning. I jump on the breaks and horn at the same time and we narrowly avoid a collision. Given my position on the road it probably would have been better to accelerate away but for a few of things - its a round about so a tight corner, I hatve a pretty gutless 250 and I am a newb and was totally taken by surprise. I am pretty pleased, however, that I had the sense to remember 90% front brake, 10% back so I didn't lock up either wheel and still felt I had complete control of the bike. I guess the Triton driver was still looking behind him for oncoming traffic and maybe didn't realise he had changed lanes. He certainly heard my horn though, but refused to acknowledge me afterwards when I caught up with him again. Thats what annoys me the most - a little wave or an apologetic smile would have made me feel heaps better.