This is from the "humor" section over at PornoTube (thanks to alwaysflower for making me aware of that amazing site) and is entitled Got Milk? ... which gives you an idea of what might be going on ... but the expressions on people's faces make this a classic ... this is what the old Candid Camera show would have been, had it been able to do R-rated stuff! I wonder if this will catch on with Starbucks???
Not hardcore, but probably not Work Safe either!