A clock radio has a slider that selects the mode: “Alarm, Music, Off, On.” The “Off” position is the third position of four. I only just now realized that this is the result of conscious thought. Placing “Off” on either end makes it very easy to turn the radio off with a swipe of the hand, which is exactly what an alarm must not allow. The very meager amount of extra difficulty created by putting “Off” in one of the two interior positions probably makes the radio quite a bit more effective.
It’s possible everybody else in the world has already thought about this.