If a cat is bored, they may start knocking things over in an attempt to entertain themselves. This is especially common if the cat doesn't have enough toys.
Cats are naturally curious creatures, and they love to investigate new things. If a cat sees something that they're not familiar with, they may knock it over to see what happens.
Cats also knock things over as a way of playing. This is especially common in kittens, who are still learning about their surroundings and how to interact with them.
Cats have a natural instinct to mark their territory. Sometimes, they do this by knocking things over.
If a cat is feeling stressed, they may start knocking things over as a way of releasing their pent-up energy.
Cats with hyperthyroidism may have an increased thirst and urination, which can lead them to knock things over in search of water.
If your cat is knocking things over, it's important to try to figure out why. Once you know the reason, you can take steps to address the issue.