[rodyancy]

I've done the sober equivalent to this (coffee shops). Not only did it point out some usability issues, like, "oh, he thinks THAT'S a button," it also proved to be a great way to generate ideas. Most of the input we received was dead wrong, but we had to think about why it was wrong, and that got us thinking in ways we hadn't thought before, which led to good ideas. I suspect the drunken version would be more fun and just as useful, assuming you are producing a consumer product. As for B2B, if your domain is specific, this might not be the most valuable use of your time.