haha I see what you mean when you talk about rooting for the same club as your friends. I've been watching every arsenal game (when possible) for a few years now, and now both my little brother and my mother are gunners. It's awsome watching your team with your favorite people.
Reading the "what country are you from" thread, I was intrigued to find out how all of you came about supporting your club, so I'll start off by sharing my brief story.
I once met a Nigerian by the name of Courage. He was an Arsenal fan and a football player back in his country. At the time, I wasn't a fan of any team in specific, I just liked a few clubs. He went on to tell me that in football, it's all about sticking with your man, no matter how well they're doing. Around that time, I began to connect with my cousins because of football, and it turned out that one of them was already an Arsenal supporter. The group of people that I would normally play with were all friends of his, and the majority of them were gunners as well. So through association, I became a gunner. It's a pretty awesome feeling, all of us rooting for the same club. The sense of unity we all shared when Arsenal won or lost was unique around my parts, and it's what kept me a gunner.
Hope you guys like this little tidbit and please share your story if you have one! If you chose a club simply because you liked them, well that's cool too. Cheers.