Because I have zero desire to look a lot like a seal.
Check this out.
http://www.youtube.com/p.swf?video_id=BdPrb1H5BWk&eurl=http%3A//video.yahoo.com/video/play%3Fei%3DUTF-8%26p%3D%2522shark%2Bjump%2522%26b%3D0%26oid%3D14306033f82a764c%26rurl%3Dwww.yout&iurl=http%3A//sjl-static1.sjl.youtube.com/vi/BdPrb1H5BWk/2.jpg&t=OEgsToPDskJZZXExiTeBjjRnEEAhFzsm