We all know that sinking feeling you get when unexpected guests turn up at the door right before Christmas. Make sure you're well prepared this year by stowing these little beauties away in your fridge or kitchen cupboard for that exact moment. You'll look like you've spent ages slaving away when really, you were just too damn prepared for your own good. Go you! We love these Quick Tiramisu Jars and Quadruple Chocolate Chip Cookie Mix Jars. Take your pick.