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I used to take a lot of pictures of my brother when he was little, because he wasn't self-conscious and would do whatever I said. One time I had him posing in front of the sliding-glass door in the porch, which had a large, heavy curtain covering it. As I was focusing the lens I told him to back up a little. Then a little more. All of a sudden he disappeared through the curtain. Turns out the sliding-glass door was open. He went tumbling backwards down the stairs into the backyard. I felt pretty bad about that. But even though I almost killed him with photography, he still kept posing for pictures. What a trooper.