One reason I have a Bonus Back-Up Alarm is the design flaw that exists in many alarm clocks. When my Primary Alarm sounds, the way to stop it is to turn off the alarm entirely. So the control is actually not just “Stop sounding the alarm today,” but “Stop sounding the alarm forever.” If I want the alarm to wake me up tomorrow, I have to push the slider back to the “On” position. Mostly this works fine, but apparently when I’m groggy (e.g. at 5:00 a.m.), it’s possible that the slider doesn’t make it all the way. So I believe I’ve reset it, but I have not.
Shouldn’t a designer minimize possible user-error on a device that’s meant to be operated by someone who just woke up?
The fact that I think about such things probably reveals way too much about me.