Poirot: I will build a hotel on Fenchurch Street.
Hastings: You can’t build a hotel on a railway station.
Poirot: Do not be absurd, Hastings. There are plenty of hotels at railway stations.
Hastings: But… that’s not in the rules.
Poirot: Well then, Hastings, the rules are wrong!
Sherlock: It’s this or Cluedo.
John: Ah no, we are never playing that again.
Sherlock: Why not?
John: Because it’s not actually possible for the victim to have done it, Sherlock, that’s why.
Sherlock: It was the only possible solution.
John: It’s not in the rules-
Sherlock: Well, then the rules are wrong!