I tried Evil Alarm, and all it did was gently vibrate and play a few seconds of music... Perhaps I didn't set it up properly?
What I would really like to see is an alarm that can't be stopped until I have opened my eyes and got my brain in gear, solving some math problem, getting through a maze or like something off one of those Brain Train games for instance. Sitting in the dark furiously shaking one's right hand is all too easy.