Many years ago I heard a story of some users in a plant being trained on how to use a system that they accessed via a dumb terminal (DEC LA120 I think).
When the instructor logged on, he made a mistake in entering his user-id, so backspaced to fix the mistake and then continued on.
When he came back some weeks later to see how the users were doing, he was dumbfounded to see them all backspace as they entered their user-ids!
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