Capsaicin and other chemicals released from dried chili peppers when heated can irritate the eyes and respiratory system. Opening the microwave after heating dried chili peppers is like spraying pepper spray on yourself.
Grapes
I believe many of you have seen videos of grapes being heated in a microwave, causing sparks. Simply put, this phenomenon occurs because grapes can accumulate energy when exposed to microwave radiation. When the energy is released, it forms a strong electromagnetic field at the point of contact between the grapes, while also interacting inside two grapes.
This electromagnetic energy is so powerful that it can ionize the air and create sparks. This is why grapes heated in a microwave can cause sparks or even explode. However, you don't need to worry about fruits like pears, apples, or bananas. These can be cut into smaller pieces and heated in the microwave before eating.