Hissing
If a cat hisses, it’s best to back away slowly. However, they also hiss when they’re agitated or afraid. You might have approached them too fast or did something they felt was wrong. Regardless, you should let them calm down before interacting with them.
Knocking Things from the Table
Cats enjoy knocking things off from high places, especially if it’s used by their human. Scientists say it’s because they’re practice hunting. In the wild, cats like to play with the prey, so batting things is good practice. They may also want to play a game!