My and my friends were going to the beach in Chiba a few weeks ago. Riding along the highway, there was this huge noise as we passed a bunch of bosozoku (Japanese biker gang members) on their tricked out bikes. The bikes have old Japanese flags, big chopper style seats with backs and the silencer removed, so they make a huge clatter as they go.
I took out my camera and shot a few pics of them, and they were all waving back. Then I took a video of one of them doing tricks. Wheelies along the highway, dangerous but fun to look at.