(1) Go to this video (or any really) http://www.youtube.com/watch?v=YNoLJy68ZcE
(2) Below the video you will see a tab for sharing. Select that tab.
(3) Once you are on the share tab, then select the embed tab.
(4) The iFrame option they offer does not work so you need to click on use old embed code.
(5) Once you have the old embed code you then simply copy and paste it to the message.
-- "Show respect even to people who don’t deserve it, not as a reflection of their character, but as a reflection of yours."