You could say that Rethink’s office windows are the eyes to its soul. Not quite what the anonymous English proverb refers to, but a fitting description of the ad agency’s digital Advent Calendar nonetheless. Each day, until the stroke of twelve on Christmas Eve, the shop will reveal the festive shenanigans (in Vine format) that take place behind its glass-paned windows. So far, we’ve learned that Rethinkers are haunted by giant flicking fingers and they know how to fake happy when accepting unwanted holiday gifts. There’s no rating given for their tomfoolery, but let’s just hope this stays PG-13.