This isn't on the list, but a nice little physical reminder for people here who pick up a lot of tetra packs on a weekly basis!
The tetra packs come in pallets of 28 which weighs a stone in total. If you regularly pick up 14 tetras a week have a good feel of the weight when your CDC hands you it - you're holding half a stone in your hands! The sheer weight of that 7lbs really made me realise how much weight I've been dragging around with me this past 50lbs and how much I'm still hauling about with the 40 to go!