Credit: Ron P. Jaffe/Fox © 2011 Fox Television. All Rights Reserved. Photo: The How I Met Your Mother Gang Gathers at Their Favorite Bar

In an episode filled with guest stars, as everyone started seeing their parents in their respective lovers, they saved the last for an oddball little cameo at the end. Sure, Weird Al Yankovic was superfluous to the actual plot, but he also may just be the catalyst for Ted's next relationship on How I Met Your Mother (Mon., 8PM ET on CBS).

Click on for more details about the upcoming ep and to watch a hilarious clip.