I got the idea while reading the "Very desperate man" thread in misc section. It started with a history of a "swimming-in-woman's-feces" man and now it's in a stage of a dispute about which better - north or south (how about west or east) and also can lead to another civil war. That's a pretty nice and smooth transition.
What are your favourite threads, which started with some subject and ended up with something completly unrelated?
Also we can have a second prize for the thread in which the subject was changed many times.
Please post thread's name, section, starter of the thread (link preferably) and the transition of the subject.