Harsh - I do that sort of thing to cars if they block my route... I pull infront of them at the lights really blocking their way and make sure to start up nice and slow when it goes green just to piss them off... dead satisfying and its a good revenge to any f****r that blocks a bike lane!
+1 I've started doing this, start up reaaally slow and pretend they're not behind you while they rev and beep the horn.
+1 I've started doing this, start up reaaally slow and pretend they're not behind you while they rev and beep the horn.