New Delhi, Jan 8 (ANI): Jennifer Aniston has revealed she has a major fear of being underwater. While explaining her fear, the 'Cake' actress asserted that she was a kid and she was riding this tricycle around a swimming pool and she drove her tricycle into the swimming pool and she didn't let go and her brother tried to help her but she could not go underwater, an online portal reported. The 'Friends' star continued that no one will believe her but she honestly cannot go underwater. Aniston stars in 'Cake' as a woman who suffers from chronic pain and a prescription painkiller addiction after surviving a horrific accident and her fear made filming some scenes in the movie quite scary because her character's treatment includes water therapy.The movie hits the theaters on January 23, 2015.