You can check out anytime you like, but you can never leave.
After waiting on hold for 15 minutes to talk to a live person so he could cancel his account, an AOL account holder was basically told no by a now unemployed customer service rep. There is a video available on the page linked above that contains a recording of this memorable conversation.
What I would like to see is a copy of the script/instructions that AOL gives its customer service reps to use when someone calls to cancel their account. Granted, this guy went a little overboard, but I suspect the reps were told to try to dissuade people from leaving.