system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why do some dishes get so hot, sometimes even hotter than the food, after microwaving?
gpt
The microwaves generated are absorbed well by water and fat in food. However, some other materials also absorb the same microwaves, often better than food.

Metal is the obvious one. It can absorb microwaves so well it catches fire and/or ruins the appliance.

Some bowls and plates made of certain ceramic also can absorb microwaves well. Sometimes it's due to trace metals in the ceramic or glaze. Other times it's just what the ceramics are made out of.