Why did President Obama stumble on his oath?

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President Obama has been so smooth every time I have ever seen him speak or do anything really. It was not a big deal when he forgot the words of the oath but just surprising to me. The President then went on to deliver an amazing speech I thought!

  The question I have though is why the stumble?  Was he just nervous as would be expected? Was it just too loud? I have attached the video and if you watch carefully in the beginning he is laughing pretty hard about something. He was fighting not to bust out completely and I believe that threw him off the entire swearing in. He also said that was for you? What do you think? What was he laughing about? Did he break wind when he stood up or what?

  I think it was a great day to be an American and I wish him well!

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