(Photo credit should read Serhii Hudak/ Ukrinform/Future Publishing via Getty Images)

The Water Bottle Fan Challenge is trending on Tik-Tok. The challenge starts with two people attaching a half-full water bottle to a ceiling fan with a string. The people then put on blindfolds and turn on the fan while trying to avoid getting hit in the face with the water bottle. People are posting hilarious videos of themselves getting hit in the head.