When not used properly, anything you hurl can lead to injuries and this includes water balloons. If you are not careful about how you throw and play with them, it can lead to injuries to the eye, ears, or skin and can become choking hazards for children under three. That is why it is important to follow sensible rules such as not letting kids under the age of six play with water balloons and having water balloon fights always be supervised by adults. All of this is important to ensure a fun, safe time.