system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why reflective things (like aluminum or 3Musketeers candy wrapper) explode in the microwave.

I stupidly tried to thaw a 3 Musketeers bar when I was little... Thought about it today and wondered why.
gpt
It isn't because it's reflective, but rather because it's metal. Metal things conduct electricity. One effect of the microwave is to make electricity flow in anything conductive inside of it. That electricity creates sparks and plasma (a lot like lightning, but on a smaller scale), making things heat up, catch fire, or explode.