I was a student of 3D modeling, who had not been working a lot with computers before this intensive training period. One night I was making pancakes at home. I never measure the amount of flour, just pour it straight from the package. For some reason, I could not control the amount of flour and way too much of it flooded into my baking bowl. Instinctually, my left hand fingers made the movement needed for the Undo command Ctrl+Z in a keyboard. Unfortunately, in this situation it did not help much.