When I was really young, my cousins and I were playing around outside and I threw a big, mostly closed cardboard box against my grandpa's barn door - for no better reason than that's what kids do. When it hit, we heard a sharp little scream and then a thud. What I didn't realize what that there was a kitten inside (probably sleeping), and I'd unintentionally broken its neck. It took a while to get over knowing that that poor little animal was dead because of me. I'll never forget that awful story.
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