Petrichor = The smell of dust after rain.
I do love this ad. Loved it since I spotted it on Twitter. (And I half-wish that BPAL would get the license to make it.)
(And, talking about the show, not the parodic commentary, I loved that a word from a telepathic password came back to them when Amy and Rory were discussing what to call their new perfume line. And I wonder if they also do a Crimson, a Delight and, of course, an Eleven in their perfume line.)