The "Wave"

I've long known about the Motorcycle Wave. The Miata has The Miata Wave. And I recently learned that Wranglers also have a wave.

This all seemed to tie nicely with Forbes recent article Most Satisfying Cars 2006 where they talked about a culture that can form around a product/brand.

I began to wonder what other vehicular segments had "waves." Or more generally, what other products/brands had developed a community with well-documented idiosyncratic customs?