I think what happens is, the first few people to read the thread read the first post and take the thread title in context. By the time the thread gets to 2 or more pages, many people don't bother reading the thread before they make their own post (as you can see by how often a post on PE repeats what was said in a previous post in the same thread). All they do is look at the subject heading and think "This guy says girls don't like Rush? Wow, I've got something to say about that". Before you know it, a thread that started with a light-hearted throwaway comment has turned into a heated debate about the meaning of life, the universe and everything.
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