^ That's a funny scene
As for adding a video to play in a post on this board, you wouldn't use "Embed"... Just copy the URL from the address bar of your web browser while at YouTube at the video you want and paste it into the post (in this case that would be, "http://www.youtube.com/watch?v=3tfI9tTzlI0", without the quotes), and then in your post here, select the address you just pasted (highlight it) by holding your left mouse button down and dragging it over the text, and then when it's highlighted click the little blue TV screen icon in the top right corner above where you type and select "YouTube" from the drop down list. This will insert into your post what's needed for the video to be embedded and play in your post.
Here's the clip:
A Serious Man - The Columbia Record Club Scene