Super Mario Bro's theme:
<iframe width="480" height="360" src="http://www.youtube.com/embed/r8E104yEmtc" frameborder="0" allowfullscreen></iframe>
Oh and also: How to embed a youtube video:
<iframe width="480" height="360" src="http://www.youtube.com/embed/ZnehCBoYLbc" frameborder="0" allowfullscreen></iframe>
:P
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