I can attest to this, being the owner of one of these 'slow' bikes, a 650cc Transalp. I regularly am able to filter my way to the front of the queue at a set of lights on my way home from work, and more often than not I'm way down the road before most of the cars have really gotten going. This was not the case on two occasions recently: First one was an M5, fair enough, you pay your £100k you can leave me for dust every day of the week no problem. Today was a.... heck I don't even know what it was, a Toyota Starlet or something equally as tiny... but off we all go, tiny car still behind me, fair enough riding a rally tourer first gear doesn't get you very far, now second gear and really getting going and I hear a dump valve right behind me and this thing really wants me to get out the way. I pull into the left lane and away he goes. I dunno what it was, but it was quick! Getting back on topic though, in my limited experience I've learnt to avoid any car that actively tries to engage with you in any negative way, be it racing, deliberately awkward road positioning, unnecessary acceleration or braking, whatever... those drivers have ego, and ego is dangerous.