This is similar to at least one I saw earlier in this thread but different enough to warrant a mention, I think.
My first computer mentor, back in the mid-1980s, had an "evil genius" streak. He was given the task one day of devising an automated training program to re-train new employees who were having trouble with even the most basic operation of the computer system.
He didn't use a spreadsheet, but it could have easily been done with Excel, had it been around at that time.
I forget what he wrote it in, but the upshot was that the user had to type in their name as part of the login, and the program would call them by their first name when they answered a question correctly. "Very good, Betty, let's try another one."
He also rigged it so that, when they got one wrong, the first name was replaced with "dumba$$" (edited for the board), so that an error got you, "No, dumba$$, try again."
He only left it in place a few days before better judgement prevailed, but oh, the possibilities.