This is a bit off the beaten path, but hey, it's using mobile telephones for awesomeness, and that's what AppSpy is all about, so why not;

'Knock Knock' by Brunettes Shoot Blondes is a simply delightful music video that's doing the rounds at the moment. It uses 14 screens - mostly mobiles and tablets - in some ingenious ways, to tell the tale of two star-crossed lovers.

Take a look, and let me know what you make of it in the comments.