So yesterday I was out for a drive in the Country. I was behind a couple of bikers. One thing you quickly notice, driving behind guys on bikes is that they wave to everyone else the come across on bikes. Its not a big wave, just sticking out your arm. But the fascinating things was that this wave ritual crossed all divisions among riders. The guys in front of me were riding Ninjas, but did the wave for the hard-core Harley riders, the RUBs, the old folks on their touring bikes and I swear, some guy on moped.
All you need is something on two wheels and you are in the secret circle of the wave.
I think the natural progression of this ritual is slapping fives with on-coming riders.