Have you seen videos of people throwing boiling water in the air to see it freeze right away? It's the latest viral challenge, and people are sent to the hospital.

In recent weeks, parts of the United States have been affected by the polar eddies that occur when winds pull south from the North Pole and run below freezing temperatures.

To test how cold the weather was, people threw boiling water into the sky to make tiny ice crystals.

Eight people who participated in the challenge were treated at the Burn Center at the Loyola University Medical Center in Chicago, according to the Chicago Sun-Times.

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The treated patients were between 3 and 53 years old and had injuries to their feet, arms, hands and face with varying degrees of burns.

According to the Centers for Disease Control and Prevention, a fire can penetrate all skin layers. It can burn it with white, black or brown spots. Symptoms of severe cases include persistent pain and redness, swelling, fever, blisters greater than two inches or mud. Doctors can treat burns with bandages, antibiotics or even tetanus shots.

The stunt has not only affected those who throw the water. Witnesses were affected as well. The water can blow back and burn the spectators when a gust of wind suddenly comes.

"We urge people not to tackle the challenge of boiling water," said Loyola Burn surgeon Arthur Sanford of the Chicago Sun-Times. "There is no sure way to do it."