Season 4, episode 23. The episode right after 22 which was entirely devoted to building up to episode 23. How much of a let down was that??
Nothing happened in this one. Nothing substantial, nothing progressive. It felt like an episode 6 at best. It wasn't particularly funny (the jokes were especially tired and unoriginal). It didn't give us any new information about any of the characters either. We didn't even get a twist at the end! I half expected a new girl to show up out of the blue in the last scene.
Oh well, HIMYM is overall a fantastic series so I can forgive this. But the season finale better be fantasticker. It's been four years already, let's see this mother we keep hearing about! If they expect us to wait until the series finale to stick her in I'll just wait for the DVD box set.