A word for an intentional error or absurdity inserted to check whether audience read an entire passage


I have a tendency to write long(ish) and detailed emails at work that I suspect the target audience don't bother to read sometimes, so occasionally I will insert something obviously silly just to see if anyone picks it up. Is there a word for that?


I am also aware of the similar practice of inserting intentional errors in, for example, maps for the purpose of detecting copyright violations - I imagine that would share the applicable terminology?




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