Helmet.

Ping pong, also known as table tennis, is a popular sport played by people all over the world. It is a fast-paced, high-energy sport that requires a lot of coordination and agility. Unfortunately, accidents can sometimes happen while playing ping pong, and some of these accidents can even be fatal.

One of the most common ways ping pong ball accidents can happen is by hitting the ball at someone's face. The ball can be hit at high speed and can pack quite a punch if it hits someone's face. This can lead to bruises, nosebleeds or even fractures of the nose or cheekbones.

There are also cases where people have tripped or fallen while playing ping pong, which can lead to injuries to the head or other parts of the body. Some people may also overheat while playing ping pong, especially if they don't drink enough water or play in a hotter environment. This can lead to dehydration or even heatstroke.

Although rare, there have also been cases of people dying while playing ping pong. In some cases, a heart attack can occur while playing this intense sport, especially in people who are already at an increased risk for heart problems. There have also been cases of people choking on a ping pong ball, especially if they tried to swallow the ball as part of a prank or challenge.

It is important to always be careful while playing ping pong and to make sure you drink enough water to avoid dehydration. It is also recommended that you wear a helmet when playing ping pong, especially if you are playing with children or inexperienced players who may not always be able to control the ball well. If you're going to a ping pong match, make sure you keep a safe distance from the table to avoid getting hit by a ball coming towards you.