This has, apparently, been around for quite some time. So you’ll have to excuse me if you’ve seen it before.
Groupon.com have built a great unsubscribe page for their email newsletter. They express sorrow to see you leave and offer a funny video to punish their IT guy responsible for sending out the email. Adding this bit of humour and the simplicity of the unsubscribe leaves you with a positive feeling about their company and service.
Click here to see their interactive Unsubscribe page.