Hmm it’s possible but I’d think a cat would easily be able to stay on its feet if the top was pushed off. But losing its balance and ending up like that also doesn’t make sense to me.

My guess is the picture taker gave the cat some kind of jump scare (which tbf could involve pushing on the top) and had the camera ready.

Though if that is the case, the joke might be on them because that cat might look for new places to do its business now that the litter box isn’t safe.