Lily puts Karen (Laura Prepon) to the porch test and she fails miserably when she won't play bridge with their future old selves. She'd rather be reading a book of course.

Ted and his old college girlfriend, Karen (Laura Prepon) sit down to a nice meal as they come back into each others' lives. Ted looks a little less enthusiastic than the beautiful Karen does.

A picture of Ted holding his girlfriend at the time, Karen (guest star Laura Prepon) in college. Can you imagine the size of the sandwiches he must have shared with her?

A picture of Ted hugging his girlfriend, Karen (guest star Laura Prepon) during their old college days as Lily looks on in disgust in this scene from the upcoming episode, "Sorry, Bro"

Marshall, Ted, Robin and Lily all stand outside the house in "The Stinsons." In this episode, the guys meet Barney's wife and child they never knew existed.

Marshall walks in on Ted in his boxers and Robin in a robe. Uh oh, what's been going on with these two exes?

Ted talks to Barney as he's busy cleaning the apartment. That's right, Barney still wears a suit even when cleaning.

Don't worry, Dave didn't have to fight those guys all by himself, Barney and Ted had his back. Right?

Josh Radnor plays Ted Mosby, the central character on How I Met Your Mother. Ted is telling the story of how he met the kids' mother.

A picture from How I Met Your Mother season 4 premiere in which Ted is waiting to hear whether Stella accepted his marriage proposal.