What's the dumbest thing you've done to fix a tech issue?
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Individually press all the Shift, Alt and Ctrl keys.
This was back in the Windows 95 days and persisted for quite a few versions. The symptoms were that when typing you’d get accented or no characters, basically Windows thought one of the keys was held down. It happened more often than you’d think.
I still see this every few months.
I think it’s happening if a key is released at the same time as a window opens or changes to full screen, but it’s too rare to properly troubleshoot. The fix is still the same.