I'm still a bit unsure whether it was the consumption of wine, or if it was genuinely funny, but we spent the evening drinking, shaking hands with strangers and laughing when prompted (and more so when not). Sounds strange. And it was. But thoroughly enjoyable. And at £5 including a glass of wine it was cheaper than therapy at least.
At one point we found ourselves part of a room full of strangers lying in a circle on the ground belting out the most hearty, hysterical laughter we could generate into the air. It was like something from a Salvador Dali video.
As a result I shall now be laughing to myself now before interviews, client presentations, first dates, weddings and barmitzfas.