Considering that many people use social media apps and other online tools while they are tired, drunk, or otherwise cognitively impaired, it's actually amazing that no-one has thought of this before... You should be getting your users to look at your website or online application (or at least testing it) while they're drunk!

The especially interesting thing about this study was that the drunk tester didn't experience the cosy feeling from the homepage that the designers had hoped for. 

I wonder if it's because alcohol makes you feel more insecure?

I'm not sure how many units of alcohol is the optimum for website testing, but it would be a lot of fun to find out. I'm sure it would create goodwill too. 

Not that we would want to encourage drinking at work, of course.