Suddenly the lights go out, causing a frisson of excitement to run through the air and down your spine. Next, by pure magic, a flame flickers into existence. This spark warmly illuminates the faces of a gaggle of friends and family, whose grins are only bettered by your own. Then, just as suddenly, the drone of ’Happy Birthday to you…” begins, but nobody cares about the singing. Why? Because we’re all imagining how good the cake will taste.