[Mac1]

“naked bike riders, and learning from all of you that this trend is growing in many American cities with a loony majority. Who would of thought?”

unfortunately, not just American cities...

http://www.viewlondon.co.uk/whatson/london-naked-bike-ride-article-3067.html

[Blue Jays]

Those folks from Critical Mass tend to be a weird bunch.
Essentially a rabble-rousing crew seeking to protest something during a regular day. A bunch of them pointlessly getting naked sounds right up their alley. Silly libs!