Lily: I'm going into the city. Just, while I'm gone, don't go snooping around in our stuff. I know you think we have a sex tape hidden somewhere, so I'll save you the trouble. We don't. Good-bye. [rewind]
Future Ted: [v.o.] Here's that moment from Barney's perspective.
Lily: [droning] We have a sex tape hidden somewhere. [droning]
Barney: Challenge accepted.