Spencer sez: Tognazzini has a great column up from July about what he calls "The Worst Interface Ever":
For $1500, you can equip your luxury car with a genuine self-destruct switch. Once it’s in place, you must remember to flip it whenever you shift from driving your car to not driving your car. Forget once or do it wrong, and your engine and transmission will self-destruct.
“
Ah, a fictitious switch,” you say, but no, it is all too real and all too destructive.
The switch is hidden under the hood, where you cannot visually inspect it. To increase the sport, it's not only left unlabeled as to function, its two positions are unlabeled, too— — make a mistake and, boom!, no more engine.
