Event 1
A friend reported her phone was constantly being drained, wasn't lasting the day on a full charge and knew how to close apps running in the background (double-click "home" button and hold down ...
... Issues in the Use of Interactive Systems.
If you've guessed it, my vote goes for whoever invented the "Undo" button: cross-platform, multi-lingual, future-proof and as everlasting as human error.
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