I'm sure I've done plenty of things like that. Three things that Justin has done came to mind though. Once Justin put the bottle of Ranch dressing under the sink rather than in the fridge.

Another time he put foil in the microwave and walked away. When he came back there was a fire in the microwave. I wasn't home when it happened. When I got home I walked into a smoked filled house, I saw ashes in the sink and the kitchen was a mess. Where was Justin? He was sitting in the bedroom eating on the bed. The inside of the microwave melted a little and was scorched black.

The worst thing though was one morning (I'd already gone to work) Justin was going to let Izzy, our iguana, swim in the bathtub before he left for work. He turned the water on and left the bathroom. He forgot about it and left for work, that was around 7:30. I came home around 12:30 and walked into our bedroom and my feet sank into the carpet. I opened the door to the bathroom and there was about 6 inches of water on the floor. The bedroom carpet was totally soaked. I got the carpet cleaner out and sucked up as much water as I could (I spent about 10 hours on it), but the carpet was completely destroyed.