Is it possible to get so much of a good that it turns into a bad if so give an example?

Yes, it is possible for an excess of a good to turn into a bad, a concept often referred to as "the law of diminishing returns." For example, while exercise is beneficial for health, excessive exercise can lead to injuries, fatigue, and burnout. Similarly, consuming too much water can result in water intoxication, disrupting the body's electrolyte balance and potentially leading to serious health issues.