I recently asked Samsung a question about a product, and of course I ended up on their crappy webmail list. Today I finally got around to clicking "unsubscribe", and this is the form I was brought to:
"Dear Samsung Customer,
Occasionally we send email messages with news and special offers. If you would prefer not to receive such messages
in the future, simply remove yourself from our email list by selecting the option below and clicking the 'Update' button.
 Please remove me from your email list.
[X] On second thought, please continue to notify me of new products and promotions
 Please change my email address to: ________________
Yes, they pre-select an "I've changed my mind" button when you click "unsubscribe" in their email. If I hadn't been paying attention, which is entirely likely, I would have assumed it was the usual blah blah and just clicked "update", thinking I was getting out.
What I really don't understand is who Samsung thinks will actually click to unsubscribe and then change their mind. Probably no one, but everyone who sees this smarmy form will be slightly ticked off at the audacity of pre-selecting a form to do exactly the opposite of what you've already indicated as a preference. It's subtle, but now I'm annoyed at Samsung more than I was when they were just spamming me. Annoying potential customers is not a good business practice!
It got worse when I pressed "update" on the form:
"We're sorry to see you go. Please allow 7-10 business days for us to process your request."
7-10 days to process a single database command? Are they still using punch cards or something?