I think this is getting a little muddled. The OP explicitly said
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incorrect, impossible or sci-fi/fantasy, but things that could be real
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That eliminates such issues as the conking on the noggin one. It also eliminates standard tropes, such as the amateur detective. As for the toilet, I think aside from the ick factor it’s just part of excluding the mundane - things you can take for granted but would be excruciating to read about in detail.