iframe shows default Youtube video

Not sure what I am doing wrong. I have posted this shortcode into a posting:

[iframe width=”100%” src=”http://www.youtube.com/watch?v=wr36FqsdzBk”%5D

And yet it displays this Youtube video:

On other posts, I have posted this shortcode:

[iframe width=”640″ src=”http://player.vimeo.com/video/62496297″%5D

And it displays the proper Vimeo video.

Any suggestions for what I am doing wrong with the YouTube video?

http://wordpress.org/extend/plugins/iframe/