Quote from Future Ted in The Sexless Innkeeper
Future Ted: [v.o.] But just when Lily and Marshall were about to give up, two of their best friends in the world got together. And hope returned to their hearts. So when Lily said... Lily: Marshall and I wanted to invite you to our place for a little couples' night. Robin: Um, sure, why not? Future Ted: Barney and Robin had no idea what they were about to walk into.