Ted: The problem was, Lily didn't want to smoke in front of her new employer. So when she arrived at the Captain's house, there was one possible course of action.
[flashback:]
Lily: Can I use your powder room?
[present:]
Ted: Now, you're Lily. You've just had a cigarette in your boss's powder room. What do you do with the cigarette butt? The window? Flush it?
Marshall: No, she wouldn't do either of those things. She's an environmentalist.
Ted: Stick it in your purse?
Billy Zabka: Marshall could find it there.
Ranjit: Throw it in the trash can?
Becky: The Captain would find it there.