19:24 07 May 2015
The 2008 Olympic decathlon champion has posted a video on YouTube showing how he used one of his javelin to help his daughter with her loose tooth.
He wrote: "What you use javelins for once you're retired."
Speaking to BBC Trending, Clay explained: "Her brother and sister were telling her different ways and mum was too. Then someone came up with the idea of the javelin and the second she heard that, that's what she wanted to happen,"
"I didn't want to do it. I was a little bit afraid of what people were going to think, what they were going to say, or that they would misunderstand and get a little upset,"
"But it takes everybody back to a time when they did the same silly things to get their teeth pulled out and she absolutely loved it and kept asking me 'Please, please, please Daddy' until I gave in."
"The only reason we taped it was to show grandpa and grandmas and to be able to show some of her friends," Clay said. "The idea of it going viral has been surprising but that's the nature of these things, I guess. They take on a life of their own."