Ted: Damn it, Lily, why are you rooting against me?
Lily: I'm not rooting against you.
Ted: Yes, you are.
Lily: No, I'm not.
Future Ted: [v.o.] Yes, she was. You see, at that very moment...
[elsewhere, in Marshall and Lily's house:]
Barney: "Long-term bets"? "Lily bets Marshall that Barney will die by murder", "Marshall bets Lily that Robin will never return the hair dryer", "Lily bets Marshall that Ted'll go bald, "Marshall bets Lily that if Ted goes bald, he'll totally pull it off" My God! They're placing bets on our lives. And I'm sorry, Ted cannot pull off bald. You know Ted.
I'm right about this. [cleaners laugh]
[at MacLaren's:]
Lily: Ted, I'm your best friend. Why would I root against you?
[back:]
Barney: "Lily bets Marshall that Ted and Robin won't end up together."
Future Ted: [v.o.] That's why.