[When Barney arrives at the apartment, the gang are waiting by the "Intervention" sign]
Barney: What?
Robin: The magic tricks.
Lily: Specifically, those involving fire.
Barney: Magic tricks? Guys, interventions are supposed to help people, not attack every little thing you don't like about them. I'm sorry, but that really steams me. That really burns me up! I mean, I am filled with a white-hot rage! [growling]
[Barney shoots a flame out of his hands, setting the intervention sign on fire. Everyone else screams.]
Barney: Thank you. [seeing the sign] Oh, shoot.
Lily: I smell hair! I smell hair!
Future Ted: [v.o.] And that's the story of the scorch mark.