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Picture this. You're walking along a path in the countryside, and you've just finished that bottle of water. The problem is, there're no bins nearby. As you turn a corner, you notice a pile of rubbish on the floor. There's all sorts of garbage here: old boxes, tyres, food wrappers, and even empty bottles. It's a pretty big pile, and you've still got that empty water bottle in your hand with no bins in sight.
You think to yourself, "well, people have already littered here – what's one more? I guess it's okay to do it in this one spot." You toss your water bottle down on the pile, stride away, and are promptly struck by lightning.