If I wanted to torture people in subtle ways, I might, say, add a single whitespace to the end of any text they copy when they use the copy+paste function.
That could make it so that login, passwords, numbers, forms being entered, things you are trying to paste into spreadsheets, etc., screw up in little idiosyncratic ways.
I'm not that cruel, though. You know who is? Microsoft! OneNote does this. And it's a great prank.
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