The same upright, clapping black cat gets dropped over a quiet classroom, bathroom stall or lap, and the creator shushes it with a finger or a hand over its mouth.
Five seconds, blue bathroom stall, and the text says Bro shush we skipping. The cat stands up, a flat hand shuts it down, done. It's short enough to loop forever, and a lot of people reply that they're skipping class right now and want tips.
Same cat, but now it pops up at the back of a lecture hall while the lecturer is far off, and a fingertip shushes it. Doing it where you could actually get caught is what gives it some tension. Most of the audience is Indonesian, and what they love is how the cat closes its mouth right on cue.
This one starts with a creator feeding a real black cat on the floor, then the clapping cat overlay stands up and he gives it a finger and a stern face. Mixing a real pet with the overlay is what makes it different from the other two. The audience answers in the meme's own style, with lines like the dog and the cat.