system
Given the following post, respond as if you're commenting on Reddit:
human
[LoZ Majora's Mask] Why does the moon have a face, and why is it so terrifying?
gpt
It wasn't the real moon, judging by the fact that one of the circus folk mentions "a really scary red-eyed moon" as if it weren't what the moon is supposed to look like. It was actually moon-like monster being summoned by the mask.

As for why it's so terrifying, that's because the mask frequently goes out of its way to inspire panic and despair. Naturally it would summon the scariest looking moon it could muster.