Percy Spencer's Microwave Oven

Origin
Percy Spencer was a radio engineer who worked on magnetrons for the company Raytheon. One day, he stood in front of an activate radar system and a chocolate bar in his pocket melted. He investigated further with eggs and popcorn and later became the first to make the microwave oven.

Effects
Perfectly cooks food in less than 30 seconds. Microwaving a bar of chocolate will cause the user to be trapped in the oven.