Mr Fox
Commonly used between two BFFs, Mr Fox originated from the film, 'Vacancy.' In a scene where a man (Mr Fox) is trying to call the police because someone is trying to kill him in a hotel. Mr Fox is unknowingly speaking to the killer on the phone, until the man proceeds to call him by his name 'Mr Fox,' thus giving away the fact that he is infact the killer. Mr Fox then proceeds to run out of the phone booth towards his hotel room whilst the killer chases him in his car.

This name is not to be confused with 'Fantastic Mr Fox' which is a children's novel written by Roald Dahl, first published in the US by Alfred A. Knopf in 1970 with illustrations by Donald Chaffin.
Mason: 911 Emergency?

David Fox: Yeah, hello. We need some help. Some people are trying to kill us. Mason: Where are you located, sir? David Fox: Me and my wife, we're at this motel, the Pinewood Motel. It's near the mountains. They've got us trapped.

Mason: Who has you trapped, sir? David Fox: I don't know. We just need help. The Pinewood Motel.

Mason: Yes, sir. Do you have an address? David Fox: No! It's near some woods. Jesus Christ, look it up!

Mason: You're going to need to settle down, sir. You'll never survive if you lose control, Mr Fox. (David realizes he's talking to Mason.)

Mason: You shouldn't be wandering around in the dark by yourself.

Mary: Hoy!
Jen: Mr fox... is that you?
Mary: IT'S MR FOX!
Jen: OH EM GEE MR FOX!