A guy had a kid who had severe learning difficulties and motor problems. However he loved typing into the computer but would get frustrated if he hit say alt and would go to the menu, or held a key down too long and get duplicates. Stuff like that. Or would accidentally close it etc.
So i wrote the worlds worst text editor, it would intercept all key presses so that nothing would be handled that would result in the cursor leaving the editor. You could hold down keys as long as you want and would only get one character, same with delete. It also made a type wtiter type noise on every key press. Pretty sure i had timing as well so if you pushed the same key twice quickly you would only get one character output.
It had no menu bar and opened full screen and would start up wherever you left it text wise.
Testing it would drive me mental. It was so frustrating to use! I can't even remember how you exited it as im pretty sure i was intercepting ctrl alt delete. This was windows xp days.
The kid liked it though!