I know that feeling. I've done it 3 times and had to buy 3 new cookers. Somehow, they just decided to start smouldering black smoke. :laugh:
Oh, geez. :laugh: Were they all the same brand, by chance? In my case, it's just that the hubby forgets to put the fan above the stove on when he's cooking, and the smoke alarm is so close to the kitchen (and so sensitive) it takes almost nothing to set them off. ^^;