What constitutes subscribing to a thread. I was browsing my profile and found quite a few that I myself did not subscribe to. :-s
You can chose to not automatically 'subscribe' by changing the options here: http://www.socaltrailriders.org/forum/profile.php?do=editoptions You can also do it on a per thread basis by clicking the 'thread tools' drop down towards the top of the thread.