With the How I Met Your Mother Season 9 finale scheduled for March 31, all main cast members appeared on The Late Show with David Letterman on Monday.

And - SPOILER ALERT!!! - they ran down a Top 10 List of the surprises you can expect to take place on the series-ender.

Note to MacLarens: Enjoy being a bar while you can! Watch now:

You can also watch How I Met Your Mother online at TV Fanatic and you can check out photos from the next all-new episode here:

How I Met Your Mother photos from "Rally"

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Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.