So, this theory is about the song Universe Cat Drowning! Tell me what you think about this theory in the comments!
As you can tell about the image, it has a box, a girl, and she's crying. I think this is connected to the song. I think the girl did what she wasn't supposed to do, which was opening the box, which I think is the Pandoras Box. She did, and received a curse. The lyrics state that she cried Every time she felt a different emotion, so I think the curse was, because you opened the box, you will cry forever.
The lyrics also say: "I'm sorry mankind", which can mean that she is sorry to all the people who she knew, so now when she feels emotion, all she's going to do is cry, and no one likes a crybaby.