Grapes explode when you put them in the microwave.

When two grapes are close to each other in a microwave, the waves they absorb bounce back and forth in the tiny space between them, creating an increasingly powerful electromagnetic field. This continues until the electromagnetic field becomes so powerful that it supercharges nearby electrolytes that then shoot out in a brief explosion of fiery plasma, the researchers report today in the Proceedings of the National Academy of Sciences.

Source, Image credit: Science Magazine