Marshall: Anyways, I just would rather do that here.
Robin: No, I'm sorry. This is our apartment now. Marshall, you have to read a magazine someplace else. Give me your key.
Marshall: Yeah, I'm not gonna do that.
Robin: Marshall.
Marshall: I seem to recall a deal being struck between three parties where in none would discuss a certain event that transpired. An event of the... [imitates a squeaky bed] ...persuasion. That key, madam, buys my silence. Good day to you both.
[later, at MacLaren's:]
Lily: You two hooked up?
Marshall: Thanks a lot, Lily. [hands over the key to Robin]