What is a metaphor about someone who is not well behaved?

A metaphor for someone who is not well behaved could be "a wild horse running unchecked through a quiet meadow." This imagery conveys their unruly nature and tendency to disrupt the peace around them, illustrating how their actions can cause chaos and discomfort in their environment. Just as a wild horse refuses to be tamed, this person resists societal norms and expectations.