On this week's new episode of How I Met Your Mother, Barney and Nora are totally ready to get it on. But there's a problem.

Actually, there are a bunch of problems, many of which are previewed in the official CBS trailer for "Noretta." See what we mean now:

Elsewhere, look for others in a relationship to face disturbing revelations of their own when they realize - yikes!!! - their significant others remind them of their parents.

Prepare to get your laughter on now, and then return to the site this week for a complete review of "Noretta," along with a TV Fanatic Round Table and, of course, the most up-to-date How I Met Your Mother quotes section on the planet.

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