This past Sunday I went on a long motorcycle trip all over Long Island with my friend James (he drove, I rode) and I noticed that every so often he would stretch out his right hand as we drove. For a while I thought he was just getting cramps but eventually I realized that he did it everytime another dude on a bike drove the other way. I asked him what the deal was, and APPARENTLY all bikers wave at each other in passing! Isn't that the most adorable thing you've ever heard? They wave like two cadet girl scouts recognizing each other from the colour of their sash and hugging on main street in front of Pop's Chocklet Shoppe!
On a serious note: when you do an image search for "biker" under google, an amazing amount of pornography comes up. Even one featuring a horse. Go ahead...see if I'm lying.