Theres always one person who decides they dont need to take their backpack off when they get on the crowded bus or tube. Its almost always someone whos 6ft 6, leaving all the sharpest buckles and zips conveniently placed at your eyeball height. Similarly theres always someone with a giant messenger bag who, rather than put the bag at their feet, decides bashing you repeatedly in the reproductive organs is their preferred option. Thanks guys, we can longer see or have kids.