I like marco's "he's just passed his test" quip.
I used to prefer the blow kiss and wave method - but recent research shows that attracts a very high fuse blowing factor. I've given it up, too dangerous. Don't swear just gives 'em fuel for the fire of ignorance which oft burns brightly in their cess pool brains.
I used to use Stu's level three method when crossing the road in a pedestrian stylee. Once I biffed the drivers window on a van that had stopped on a crossing just as we had right of way. It smashed - I must've caught it just right. Legged it off into London streets while van driver recovered from shock. That was a few years ago. More recently some geezer driving a big 4x4 was croozing down Wallyville high street. He had a small child in the front not strapped in, was smoking a fag and talking on a mobile. I guess he must've been a circus juggler or something.... Anyhoo he drifted onto the pelican crossing and stopped on it completely blocking everyone's safe pedestrian passage (leave it!!). I let this great hulking bruiser have it verbally - no swearing but he got the message. He got out of his 4x4 and advanced menacingly telling me and the assembled throng just what he thought of me and road safety and how he was going to tear me a new something or other and stick the traffic lights where the sun don't shine. He was seriously miffed and I was looking good for a pasting. I backed away steadly and he continued to advance - his rage and associated swearing (utter filth by now) just biling (that was meant to say boiling but I'll leave it methinks) over. I've never been so pleased to see the rozzers. They appeared stage left over his shoulder (he didn't see 'em coming) and they caught most of what he said and threatened. Tee hee and all that but it taught me a lesson - I can't afford personal protection and if these eejits'll block a crossing they'll think nowt of taking yer block off too.
Easy squeezy is now my motto, plus the odd fist shake and a rather worryingly indifferent sounding "steady on there" or such like.
Snoop