Ryan Block, who works at AOL and at one time was Engadget's editor-in-chief and is co-founder of gdgt, was moving and decided he wanted to cancel his Comcast service and start at his new home with a different provider.

Simple, right? Just pick up the phone, call Comcast and disconnect. REMOVE ALL SHARP OBJECTS FROM THE ROOM! :-D

Update: Comcast has released a statement saying it's "very embarrassed" at the way Block was treated by its retention rep:

We are very embarrassed by the way our employee spoke with Mr. Block and are contacting him to personally apologize. The way in which our representative communicated with him is unacceptable and not consistent with how we train our customer service representatives. We are investigating this situation and will take quick action. While the overwhelming majority of our employees work very hard to do the right thing every day, we are using this very unfortunate experience to reinforce how important it is to always treat our customers with the utmost respect

Update 2: Slate explains why the Comcast retention rep was so aggressive. According to a former Comcast employee, his paycheck depended on it:

In retention, the more products you save per customer the better you do, and the more products you disconnect the worst you do (if a customer with a triple play disconnects, you get hit as losing every one of those lines of business, not just losing one customer). These guys fight tooth and nail to keep every customer because if they don't meet their numbers they don't get paid.