She wasn't afraid to tell the world about her Hugh Hefner romance, but Kendra Wilkinson was apparently too scared to dive into the deep end of a pool. The former Playboy Playmate and Girl Next Door quit reality diving series Splash last night in pretty dramatic fashion. She walked to the top of the 23-foot diving platform and then came back down, telling her teammates with tears in her eyes, "This is the first time in my life I've quit something. This will haunt me for the rest of my life." She had earlier admitted having an extreme fear of heights, and tweeted last night that it was a "big mistake" to sign up for the show, USA Today reports.