Spare a thought for all the Starbucks baristas out there, because they have been working overtime at the moment. An explosion in popularity among Gen Z has led to a deluge of complex custom orders every day, sometimes leading to long queues barely after their stores have opened. Not only do they have to make up all sorts of bizarre concoctions nowadays, but sometimes they can be distinctly unappetizing too. When @kenmixtape received a certain order at the branch that he works at in Georgia, he …