The possessed alarm clock

Two years ago my aunt jill had rob's name for xmas. She asked me what she could get him, I told her that we had an alarm clock that would go off every single day whether it was set or not. So I told her to get him a new one and she did. Well, that one does the same thing. I guess it's not such a bad thing because you don't have to think about setting it-it will go off whether the set alarm button is switched to on or off. So I started to wonder-does this thing go off even when we are out of town? We've never come home to it going off. Now that would be REALLY weird. I asked amber and bryan last night and they said that it does go off when we're not home. So there goes that theory. Am I the only one that this has happened to?!?!? Two alarm clocks in a row with minds of their own-very strange.....