S7E3 - Chekhov's Gun
If you say in the first chapter that there is a rifle hanging on the wall, in the second or third chapter it absolutely must go off. If it's not going to be fired, it shouldn't be hanging there. It's wrong to make promises you don't mean to keep. - Anton Chekhov
S7E2 - Chekhov's Red Herring and the Shaggy Dog
There is nothing more deceptive than an obvious fact - Sir Arthur Conan Doyle