Overheated his coffee.
Cut the cable to the coffee maker.
Clipped his newspaper.
Put the cactus on his chair.
Microwaved his keys.
Made him trip over the car.
Spiked his cereal.
Lit cat to make cereal go on his head.
Lit cat AGAIN once it jumped him, and subsequently lit HIM.
First I made sure the car was out. Then I overheated the coffee. Cactus on chair. Clicked the car to make it get thrown out again so he trips on it twice. Cut the paper. Spiked the cereal. Lit the cat on fire so the cereal landed on his head and caught him on fire. Then I made the keys redhot with the oven.