As close to a trigger warning as I'll go: "If you are not disturbed at some point in this class, you have not been paying enough attention."
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I don't really know what this means. You'd agree that some people are more fragile than others, no? And giving them a heads up isn't wrong.
(I just find it awfully convenient that classes that try to impart a full picture of the human experience are the ones told to beware.)