Cisco Employee
At some point some prankster replied with the following:
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Ah, but you can't unsubscribe like that.
You need to use:
UN-UNSUBSCRIBE
In the subject line. Capitalization is important.
For the especially bright people it might be worth digging out a recipe of casserole
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Immediately a ton of e-mails started arriving with "UN-UNSUBSCRIBE" subject line!
I think the stop to the whole madness was put by a guy in Israel who wrote the following:
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Maybe this link will help unsubscribe: http://bit.ly/16t2VYr
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The link contained (and I believe still contains) an HTML form that in Q and A format convinces people that the way to stop the storm is just to stop replying to the thread.