Last time Crispin brough out Dr. Angus [1] he was selling the Angus Diet. Now he's back, this time shilling BK's Angus 'Shroom & Swiss sandwich and wants you to discover the power of Power Sitting [2]. (flash site)

The site and concept is all about the sandwich making you want to sit down to enjoy it.
There's a Power Sitting book, which you can download on the site. Here's an excerpt:

They offer various ways to sit, like:

There are testimonials and in the promotional section you'll find the TV spots. There's a :60, 2 :15s, and a 2:15.

Links:
[1] http://ad-rag.com/112403.php
[2] http://www.powersitting.com
[3] http://technorati.com/tag/Adland exclusive