No, noone trapped a cat in a box… also not an abandoned cat singing in a box… and also, NOT a dick in a box (NSFW)…
…instead, it’s the cat who wants to get in a box! 
Cat’s owner mugumogu has a YouTube channel filled with his cat’s videos.
Here’s another one:
Can you guess what the cat is thinking while doing that?
Wanna see more cat antics? Try the Talking Cats and Dogs post!
Source: SankakuComplex (NSFW)
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Cute cat.