Re: Feeling Old...
I still remember pre-DOS and even pre-CPM when the input device was a teletype, so no on-screen detection.
We had a program (weren't call apps back then) where you had to type OFF to leave it. As there was no way of correcting typos the program just looked at the last 3 characters typed in.
A technician using the program forgot the OFF sequence and tried typing in EXIT, BYE, DONE etc all to no avail. Finally in a fit of rage he typed in F*** OFF. Bingo!