http://www.youtube.com/v/PlcV0bP1Vks?fs=1&hl=en_US
To embed Flash, copy the embed link HTML that Youtube gives you:
<object width="640" height="385"><param name="movie" value="http://www.youtube.com/v/PlcV0bP1Vks&color1=0xb1b1b1&color2=0xd0d0d0&hl=en_US&feature=player_embedded&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowScriptAccess" value="always"></param><embed src="http://www.youtube.com/v/PlcV0bP1Vks&color1=0xb1b1b1&color2=0xd0d0d0&hl=en_US&feature=player_embedded&fs=1" type="application/x-shockwave-flash" allowfullscreen="true" allowScriptAccess="always" width="640" height="385"></embed></object>
Take note of the object width and height. Use the flash tag and use the embed src:
[flash=640,385]http://www.youtube.com/v/PlcV0bP1Vks?fs=1&hl=en_US[/flash]
Done and done.