[flashback:]
Barney: All right, next challenge.
Lily: Oh, this is an all-night thing? Okay. Um... Pick up a girl wearing a garbage bag.
Barney: I'd be Glad to. Just hope she's not too Hefty. And those are all of the brands of trash bags I can think of.
Lily: I'm not done. You also can't use the letter E.
Barney: Challng accptd!