Apparently, there's an iPhone app that does this. So if anybody out there is still in a mind-altered state from breathing in too much Valentine's Day craziness, and getting all pee-in-your-pants excited about the fact that someone actually went to the trouble of getting a Costa Coffee barista to do this especially for you, I would like to take this opportunity to say- JUST! CALM! DOWN!
P.S- And by 'anybody', I mean 'me'.