Lily: So, Jeanette's squatting in your room?
Barney: What are you guys doing here?
Robin: We heard you screaming from three blocks away.
Lily: Why is she in there?
Barney: Lily, there is no reason why. That's like asking why is the earth round? Why does the sun come up in the morning? What do I do for a living? There are some questions we're not meant to know the answer to. Crazy girls are crazy because they're crazy.